feat: Improvements to pairedItem

packages/cli/src/Interfaces.ts

@@ -8,6 +8,7 @@ import {
 	IDataObject,
 	IDeferredPromise,
 	IExecuteResponsePromiseData,
+	IPinData,
 	IRun,
 	IRunData,
 	IRunExecutionData,
@@ -15,7 +16,6 @@ import {
 	ITelemetrySettings,
 	ITelemetryTrackProperties,
 	IWorkflowBase as IWorkflowBaseWorkflow,
-	PinData,
 	Workflow,
 	WorkflowExecuteMode,
 } from 'n8n-workflow';
@@ -689,7 +689,7 @@ export interface IWorkflowExecutionDataProcess {
 	executionMode: WorkflowExecuteMode;
 	executionData?: IRunExecutionData;
 	runData?: IRunData;
-	pinData?: PinData;
+	pinData?: IPinData;
 	retryOf?: number | string;
 	sessionId?: string;
 	startNodes?: string[];

packages/cli/src/Server.ts

@@ -70,11 +70,11 @@ import {
 	INodeType,
 	INodeTypeDescription,
 	INodeTypeNameVersion,
+	IPinData,
 	ITelemetrySettings,
 	IWorkflowBase,
 	LoggerProxy,
 	NodeHelpers,
-	PinData,
 	WebhookHttpMethod,
 	Workflow,
 	WorkflowExecuteMode,
@@ -2836,7 +2836,7 @@ const TRIGGER_NODE_SUFFIXES = ['trigger', 'webhook'];
 const isTrigger = (str: string) =>
 	TRIGGER_NODE_SUFFIXES.some((suffix) => str.toLowerCase().includes(suffix));
 
-function findFirstPinnedTrigger(workflow: IWorkflowDb, pinData?: PinData) {
+function findFirstPinnedTrigger(workflow: IWorkflowDb, pinData?: IPinData) {
 	if (!pinData) return;
 
 	const firstPinnedTriggerName = Object.keys(pinData).find(isTrigger);

packages/cli/src/WorkflowRunnerProcess.ts

@@ -230,6 +230,7 @@ export class WorkflowRunnerProcess {
 			nodeTypes,
 			staticData: this.data.workflowData.staticData,
 			settings: this.data.workflowData.settings,
+			pinData: this.data.pinData,
 		});
 		await checkPermissionsForExecution(this.workflow, userId);
 		const additionalData = await WorkflowExecuteAdditionalData.getBase(

packages/cli/src/databases/entities/WorkflowEntity.ts

@@ -2,7 +2,7 @@
 /* eslint-disable import/no-cycle */
 import { Length } from 'class-validator';
 
-import { IConnections, IDataObject, INode, IWorkflowSettings, PinData } from 'n8n-workflow';
+import { IConnections, IDataObject, INode, IPinData, IWorkflowSettings } from 'n8n-workflow';
 
 import {
 	BeforeUpdate,
@@ -122,7 +122,7 @@ export class WorkflowEntity implements IWorkflowDb {
 		nullable: true,
 		transformer: serializer,
 	})
-	pinData: PinData;
+	pinData: IPinData;
 
 	@BeforeUpdate()
 	setUpdateDate() {

packages/cli/src/requests.d.ts

@@ -6,9 +6,9 @@ import {
 	ICredentialNodeAccess,
 	INode,
 	INodeCredentialTestRequest,
+	IPinData,
 	IRunData,
 	IWorkflowSettings,
-	PinData,
 } from 'n8n-workflow';
 
 import { User } from './databases/entities/User';
@@ -72,7 +72,7 @@ export declare namespace WorkflowRequest {
 		{
 			workflowData: IWorkflowDb;
 			runData: IRunData;
-			pinData: PinData;
+			pinData: IPinData;
 			startNodes?: string[];
 			destinationNode?: string;
 		}

packages/cli/test/integration/workflows.api.test.ts

@@ -4,7 +4,7 @@ import * as utils from './shared/utils';
 import * as testDb from './shared/testDb';
 import { WorkflowEntity } from '../../src/databases/entities/WorkflowEntity';
 import type { Role } from '../../src/databases/entities/Role';
-import { PinData } from 'n8n-workflow';
+import { IPinData } from 'n8n-workflow';
 
 jest.mock('../../src/telemetry');
 
@@ -44,7 +44,7 @@ test('POST /workflows should store pin data for node in workflow', async () => {
 
 	expect(response.statusCode).toBe(200);
 
-	const { pinData } = response.body.data as { pinData: PinData };
+	const { pinData } = response.body.data as { pinData: IPinData };
 
 	expect(pinData).toMatchObject({ Spotify: [{ myKey: 'myValue' }] });
 });
@@ -59,7 +59,7 @@ test('POST /workflows should set pin data to null if no pin data', async () => {
 
 	expect(response.statusCode).toBe(200);
 
-	const { pinData } = response.body.data as { pinData: PinData };
+	const { pinData } = response.body.data as { pinData: IPinData };
 
 	expect(pinData).toBeNull();
 });
@@ -78,7 +78,7 @@ test('GET /workflows/:id should return pin data', async () => {
 
 	expect(workflowRetrievalResponse.statusCode).toBe(200);
 
-	const { pinData } = workflowRetrievalResponse.body.data as { pinData: PinData };
+	const { pinData } = workflowRetrievalResponse.body.data as { pinData: IPinData };
 
 	expect(pinData).toMatchObject({ Spotify: [{ myKey: 'myValue' }] });
 });

packages/core/src/WorkflowExecute.ts

@@ -19,6 +19,7 @@ import {
 	INode,
 	INodeConnections,
 	INodeExecutionData,
+	IPinData,
 	IRun,
 	IRunData,
 	IRunExecutionData,
@@ -32,7 +33,6 @@ import {
 	LoggerProxy as Logger,
 	NodeApiError,
 	NodeOperationError,
-	PinData,
 	Workflow,
 	WorkflowExecuteMode,
 	WorkflowOperationError,
@@ -88,7 +88,7 @@ export class WorkflowExecute {
 		workflow: Workflow,
 		startNode?: INode,
 		destinationNode?: string,
-		pinData?: PinData,
+		pinData?: IPinData,
 	): PCancelable<IRun> {
 		// Get the nodes to start workflow execution from
 		startNode = startNode || workflow.getStartNode(destinationNode);
@@ -160,7 +160,7 @@ export class WorkflowExecute {
 		runData: IRunData,
 		startNodes: string[],
 		destinationNode: string,
-		pinData?: PinData,
+		pinData?: IPinData,
 		// @ts-ignore
 	): PCancelable<IRun> {
 		let incomingNodeConnections: INodeConnections | undefined;

packages/editor-ui/src/Interface.ts

@@ -14,6 +14,7 @@ import {
 	INodePropertyOptions,
 	INodeTypeDescription,
 	INodeTypeNameVersion,
+	IPinData,
 	IRunExecutionData,
 	IRun,
 	IRunData,
@@ -21,15 +22,9 @@ import {
 	ITelemetrySettings,
 	IWorkflowSettings as IWorkflowSettingsWorkflow,
 	WorkflowExecuteMode,
-	PinData,
 	PublicInstalledPackage,
 } from 'n8n-workflow';
 
-import {
-	COMMUNITY_PACKAGE_MANAGE_ACTIONS,
-} from './constants';
-
-
 export * from 'n8n-design-system/src/types';
 
 declare module 'jsplumb' {
@@ -218,7 +213,7 @@ export interface IStartRunData {
 	startNodes?: string[];
 	destinationNode?: string;
 	runData?: IRunData;
-	pinData?: PinData;
+	pinData?: IPinData;
 }
 
 export interface IRunDataUi {
@@ -253,7 +248,7 @@ export interface IWorkflowData {
 	connections: IConnections;
 	settings?: IWorkflowSettings;
 	tags?: string[];
-	pinData?: PinData;
+	pinData?: IPinData;
 }
 
 export interface IWorkflowDataUpdate {
@@ -264,7 +259,7 @@ export interface IWorkflowDataUpdate {
 	settings?: IWorkflowSettings;
 	active?: boolean;
 	tags?: ITag[] | string[]; // string[] when store or requested, ITag[] from API response
-	pinData?: PinData;
+	pinData?: IPinData;
 }
 
 export interface IWorkflowTemplate {
@@ -287,7 +282,7 @@ export interface IWorkflowDb {
 	connections: IConnections;
 	settings?: IWorkflowSettings;
 	tags?: ITag[] | string[]; // string[] when store or requested, ITag[] from API response
-	pinData?: PinData;
+	pinData?: IPinData;
 }
 
 // Identical to cli.Interfaces.ts

packages/editor-ui/src/components/Error/NodeErrorView.vue

@@ -2,7 +2,7 @@
 	<div>
 		<div class="error-header">
 			<div class="error-message">{{ $locale.baseText('nodeErrorView.error') + ': ' + getErrorMessage() }}</div>
-			<div class="error-description" v-if="error.description">{{error.description}}</div>
+			<div class="error-description" v-if="error.description">{{getErrorDescription()}}</div>
 		</div>
 		<details>
 			<summary class="error-details__summary">
@@ -139,6 +139,14 @@ export default mixins(
 		},
 	},
 	methods: {
+		getErrorDescription (): string {
+			if (!this.error.context || !this.error.context.descriptionTemplate) {
+				return this.error.description;
+			}
+
+			const parameterName = this.parameterDisplayName(this.error.context.parameter);
+			return this.error.context.descriptionTemplate.replace(/%%PARAMETER%%/g, parameterName);
+		},
 		getErrorMessage (): string {
 			if (!this.error.context || !this.error.context.messageTemplate) {
 				return this.error.message;

packages/editor-ui/src/components/RunData.vue

@@ -343,7 +343,6 @@ import {
 	INodeTypeDescription,
 	IRunData,
 	IRunExecutionData,
-	PinData,
 } from 'n8n-workflow';
 
 import {

packages/editor-ui/src/components/VariableSelector.vue

@@ -21,10 +21,10 @@ import {
 	IContextObject,
 	IDataObject,
 	INodeExecutionData,
+	IPinData,
 	IRunData,
 	IRunExecutionData,
 	IWorkflowDataProxyAdditionalKeys,
-	PinData,
 	Workflow,
 	WorkflowDataProxy,
 } from 'n8n-workflow';
@@ -307,11 +307,11 @@ export default mixins(
 			 * Get the node's output using pinData
 			 *
 			 * @param {string} nodeName The name of the node to get the data of
-			 * @param {PinData[string]} pinData The node's pin data
+			 * @param {IPinData[string]} pinData The node's pin data
 			 * @param {string} filterText Filter text for parameters
 			 * @param {boolean} [useShort=false] Use short notation $json vs. $node[NodeName].json
 			 */
-			getNodePinDataOutput(nodeName: string, pinData: PinData[string], filterText: string, useShort = false): IVariableSelectorOption[] | null {
+			getNodePinDataOutput(nodeName: string, pinData: IPinData[string], filterText: string, useShort = false): IVariableSelectorOption[] | null {
 				const outputData = pinData.map((data) => ({ json: data } as INodeExecutionData))[0];
 
 				return this.getNodeOutput(nodeName, outputData, filterText, useShort);

packages/editor-ui/src/components/mixins/pinData.ts

@@ -1,17 +1,17 @@
 import Vue from 'vue';
-import { INodeUi } from "@/Interface";
+import { INodeUi } from '@/Interface';
-import {IDataObject, PinData} from "n8n-workflow";
+import { IPinData } from 'n8n-workflow';
-import {stringSizeInBytes} from "@/components/helpers";
+import { stringSizeInBytes } from '@/components/helpers';
-import {MAX_WORKFLOW_PINNED_DATA_SIZE, PIN_DATA_NODE_TYPES_DENYLIST} from "@/constants";
+import { MAX_WORKFLOW_PINNED_DATA_SIZE, PIN_DATA_NODE_TYPES_DENYLIST } from '@/constants';
 
-interface PinDataContext {
+interface IPinDataContext {
 	node: INodeUi;
 	$showError(error: Error, title: string): void;
 }
 
-export const pinData = (Vue as Vue.VueConstructor<Vue & PinDataContext>).extend({
+export const pinData = (Vue as Vue.VueConstructor<Vue & IPinDataContext>).extend({
 	computed: {
-		pinData (): PinData[string] | undefined {
+		pinData (): IPinData[string] | undefined {
 			return this.node ? this.$store.getters['pinDataByNodeName'](this.node!.name) : undefined;
 		},
 		hasPinData (): boolean {

packages/editor-ui/src/components/mixins/workflowHelpers.ts

@@ -21,6 +21,7 @@ import {
 	INodeTypeData,
 	INodeTypeDescription,
 	INodeVersionedType,
+	IPinData,
 	IRunData,
 	IRunExecutionData,
 	IWorfklowIssues,
@@ -30,7 +31,6 @@ import {
 	IExecuteData,
 	INodeConnection,
 	IWebhookDescription,
-	PinData,
 } from 'n8n-workflow';
 
 import {
@@ -330,11 +330,16 @@ export const workflowHelpers = mixins(
 
 				const workflowName = this.$store.getters.workflowName;
 
-				if (copyData === true) {
+				return new Workflow({
-					return new Workflow({ id: workflowId, name: workflowName, nodes: JSON.parse(JSON.stringify(nodes)), connections: JSON.parse(JSON.stringify(connections)), active: false, nodeTypes, settings: this.$store.getters.workflowSettings});
+					id: workflowId,
-				} else {
+					name: workflowName,
-					return new Workflow({ id: workflowId, name: workflowName, nodes, connections, active: false, nodeTypes, settings: this.$store.getters.workflowSettings});
+					nodes: copyData ? JSON.parse(JSON.stringify(nodes)) : nodes,
-				}
+					connections: copyData? JSON.parse(JSON.stringify(connections)): connections,
+					active: false,
+					nodeTypes,
+					settings: this.$store.getters.workflowSettings,
+					pinData: this.$store.getters.pinData,
+				});
 			},
 
 			// Returns the currently loaded workflow as JSON.
@@ -526,7 +531,7 @@ export const workflowHelpers = mixins(
 				}
 
 				parentNode.forEach((parentNodeName) => {
-					const pinData: PinData[string] = this.$store.getters['pinDataByNodeName'](parentNodeName);
+					const pinData: IPinData[string] = this.$store.getters['pinDataByNodeName'](parentNodeName);
 
 					if (pinData) {
 						runExecutionData = {

packages/editor-ui/src/store.ts

@@ -13,10 +13,10 @@ import {
 	INodeConnections,
 	INodeIssueData,
 	INodeTypeDescription,
+	IPinData,
 	IRunData,
 	ITaskData,
 	IWorkflowSettings,
-	PinData,
 } from 'n8n-workflow';
 
 import {
@@ -213,7 +213,7 @@ export const store = new Vuex.Store({
 		},
 
 		// Pin data
-		pinData(state, payload: { node: INodeUi, data: PinData[string] }) {
+		pinData(state, payload: { node: INodeUi, data: IPinData[string] }) {
 			if (state.workflow.pinData) {
 				Vue.set(state.workflow.pinData, payload.node.name, payload.data);
 			}
@@ -651,7 +651,7 @@ export const store = new Vuex.Store({
 			Vue.set(state.workflow, 'settings', workflowSettings);
 		},
 
-		setWorkflowPinData(state, pinData: PinData) {
+		setWorkflowPinData(state, pinData: IPinData) {
 			Vue.set(state.workflow, 'pinData', pinData);
 
 			dataPinningEventBus.$emit('pin-data', pinData);
@@ -905,7 +905,7 @@ export const store = new Vuex.Store({
 		 * Pin data
 		 */
 
-		pinData: (state): PinData | undefined => {
+		pinData: (state): IPinData | undefined => {
 			return state.workflow.pinData;
 		},
 		pinDataByNodeName: (state) => (nodeName: string) => {

packages/editor-ui/src/views/NodeView.vue

@@ -184,18 +184,18 @@ import {
 	IDataObject,
 	INode,
 	INodeConnections,
+	INodeCredentialsDetails,
 	INodeIssues,
 	INodeTypeDescription,
 	INodeTypeNameVersion,
-	NodeHelpers,
+	IPinData,
-	Workflow,
 	IRun,
 	ITaskData,
-	INodeCredentialsDetails,
-	TelemetryHelpers,
 	ITelemetryTrackProperties,
 	IWorkflowBase,
-	PinData,
+	NodeHelpers,
+	TelemetryHelpers,
+	Workflow,
 } from 'n8n-workflow';
 import {
 	ICredentialsResponse,
@@ -2963,7 +2963,7 @@ export default mixins(
 					await this.importWorkflowData(workflowData);
 				}
 			},
-			addPinDataConnections(pinData: PinData) {
+			addPinDataConnections(pinData: IPinData) {
 				Object.keys(pinData).forEach((nodeName) => {
 					// @ts-ignore
 					const connections = this.instance.getConnections({
@@ -2978,7 +2978,7 @@ export default mixins(
 					});
 				});
 			},
-			removePinDataConnections(pinData: PinData) {
+			removePinDataConnections(pinData: IPinData) {
 				Object.keys(pinData).forEach((nodeName) => {
 					// @ts-ignore
 					const connections = this.instance.getConnections({

packages/workflow/src/ExpressionError.ts

@@ -10,6 +10,7 @@ export class ExpressionError extends ExecutionBaseError {
 		options?: {
 			causeDetailed?: string;
 			description?: string;
+			descriptionTemplate?: string;
 			runIndex?: number;
 			itemIndex?: number;
 			messageTemplate?: string;
@@ -23,6 +24,10 @@ export class ExpressionError extends ExecutionBaseError {
 			this.description = options.description;
 		}
 
+		if (options?.descriptionTemplate !== undefined) {
+			this.context.descriptionTemplate = options.descriptionTemplate;
+		}
+
 		if (options?.causeDetailed !== undefined) {
 			this.context.causeDetailed = options.causeDetailed;
 		}

packages/workflow/src/Interfaces.ts

@@ -839,10 +839,9 @@ export interface INode {
 	parameters: INodeParameters;
 	credentials?: INodeCredentials;
 	webhookId?: string;
-	pinData?: IDataObject;
 }
 
-export interface PinData {
+export interface IPinData {
 	[nodeName: string]: IDataObject[];
 }
 
@@ -1328,7 +1327,7 @@ export interface IRunExecutionData {
 	resultData: {
 		error?: ExecutionError;
 		runData: IRunData;
-		pinData?: PinData;
+		pinData?: IPinData;
 		lastNodeExecuted?: string;
 	};
 	executionData?: {
@@ -1402,7 +1401,7 @@ export interface IWorkflowBase {
 	connections: IConnections;
 	settings?: IWorkflowSettings;
 	staticData?: IDataObject;
-	pinData?: PinData;
+	pinData?: IPinData;
 }
 
 export interface IWorkflowCredentials {

packages/workflow/src/Workflow.ts

@@ -28,6 +28,7 @@ import {
 	INodes,
 	INodeType,
 	INodeTypes,
+	IPinData,
 	IPollFunctions,
 	IRunExecutionData,
 	ITaskDataConnections,
@@ -84,6 +85,8 @@ export class Workflow {
 	// ids of registred webhooks of nodes
 	staticData: IDataObject;
 
+	pinData?: IPinData;
+
 	// constructor(id: string | undefined, nodes: INode[], connections: IConnections, active: boolean, nodeTypes: INodeTypes, staticData?: IDataObject, settings?: IWorkflowSettings) {
 	constructor(parameters: {
 		id?: string;
@@ -94,10 +97,12 @@ export class Workflow {
 		nodeTypes: INodeTypes;
 		staticData?: IDataObject;
 		settings?: IWorkflowSettings;
+		pinData?: IPinData;
 	}) {
 		this.id = parameters.id;
 		this.name = parameters.name;
 		this.nodeTypes = parameters.nodeTypes;
+		this.pinData = parameters.pinData;
 
 		// Save nodes in workflow as object to be able to get the
 		// nodes easily by its name.
@@ -410,6 +415,17 @@ export class Workflow {
 		return null;
 	}
 
+	/**
+	 * Returns the pinData of the node with the given name if it exists
+	 *
+	 * @param {string} nodeName Name of the node to return the pinData of
+	 * @returns {(IDataObject[] | undefined)}
+	 * @memberof Workflow
+	 */
+	getPinDataOfNode(nodeName: string): IDataObject[] | undefined {
+		return this.pinData ? this.pinData[nodeName] : undefined;
+	}
+
 	/**
 	 * Renames nodes in expressions
 	 *

packages/workflow/src/WorkflowDataProxy.ts

@@ -532,11 +532,27 @@ export class WorkflowDataProxy {
 		const createExpressionError = (
 			message: string,
 			context?: {
-				messageTemplate?: string;
-				description?: string;
 				causeDetailed?: string;
+				description?: string;
+				descriptionTemplate?: string;
+				messageTemplate?: string;
 			},
+			nodeName?: string,
 		) => {
+			if (nodeName) {
+				const pinData = this.workflow.getPinDataOfNode(nodeName);
+
+				if (pinData) {
+					if (!context) {
+						context = {};
+					}
+					message = `‘${nodeName}‘ must be unpinned to execute`;
+					context.description = `To fetch the data the expression needs, The node ‘${nodeName}’ needs to execute without being pinned. <a>Unpin it</a>`;
+					context.description = `To fetch the data for the expression, you must unpin the node '${nodeName}' and execute the workflow again.`;
+					context.descriptionTemplate = `To fetch the data for the expression under '%%PARAMETER%%', you must unpin the node '${nodeName}' and execute the workflow again.`;
+				}
+			}
+
 			return new ExpressionError(message, {
 				runIndex: that.runIndex,
 				itemIndex: that.itemIndex,
@@ -560,6 +576,7 @@ export class WorkflowDataProxy {
 				};
 			}
 
+			let nodeBeforeLast: string | undefined;
 			while (sourceData !== null && destinationNodeName !== sourceData.previousNode) {
 				taskData =
 					that.runExecutionData!.resultData.runData[sourceData.previousNode][
@@ -569,20 +586,29 @@ export class WorkflowDataProxy {
 				const previousNodeOutput = sourceData.previousNodeOutput || 0;
 				if (previousNodeOutput >= taskData.data!.main.length) {
 					// `Could not resolve as the defined node-output is not valid on node '${sourceData.previousNode}'.`
-					throw createExpressionError('Can’t get data for expression', {
+					throw createExpressionError(
-						messageTemplate: 'Can’t get data for expression under ‘%%PARAMETER%%’',
+						'Can’t get data for expression',
-						description: `Apologies, this is an internal error. See details for more information`,
+						{
-						causeDetailed: 'Referencing a non-existent output on a node, problem with source data',
+							messageTemplate: 'Can’t get data for expression under ‘%%PARAMETER%%’',
-					});
+							description: `Apologies, this is an internal error. See details for more information`,
+							causeDetailed:
+								'Referencing a non-existent output on a node, problem with source data',
+						},
+						nodeBeforeLast,
+					);
 				}
 
 				if (pairedItem.item >= taskData.data!.main[previousNodeOutput]!.length) {
 					// `Could not resolve as the defined item index is not valid on node '${sourceData.previousNode}'.
-					throw createExpressionError('Can’t get data for expression', {
+					throw createExpressionError(
-						messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
+						'Can’t get data for expression',
-						description: `Item points to an item which does not exist`,
+						{
-						causeDetailed: `The pairedItem data points to an item ‘${pairedItem.item}‘ which does not exist on node ‘${sourceData.previousNode}‘ (output node did probably supply a wrong one)`,
+							messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
-					});
+							description: `Item points to an item which does not exist`,
+							causeDetailed: `The pairedItem data points to an item ‘${pairedItem.item}‘ which does not exist on node ‘${sourceData.previousNode}‘ (output node did probably supply a wrong one)`,
+						},
+						nodeBeforeLast,
+					);
 				}
 
 				const itemPreviousNode: INodeExecutionData =
@@ -590,11 +616,15 @@ export class WorkflowDataProxy {
 
 				if (itemPreviousNode.pairedItem === undefined) {
 					// `Could not resolve, as pairedItem data is missing on node '${sourceData.previousNode}'.`,
-					throw createExpressionError('Can’t get data for expression', {
+					throw createExpressionError(
-						messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
+						'Can’t get data for expression',
-						description: `To fetch the data from other nodes that this expression needs, more information is needed from the node ‘${sourceData.previousNode}’`,
+						{
-						causeDetailed: `Missing pairedItem data (node ‘${sourceData.previousNode}’ did probably not supply it)`,
+							messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
-					});
+							description: `To fetch the data from other nodes that this expression needs, more information is needed from the node ‘${sourceData.previousNode}’`,
+							causeDetailed: `Missing pairedItem data (node ‘${sourceData.previousNode}’ did probably not supply it)`,
+						},
+						sourceData.previousNode,
+					);
 				}
 
 				if (Array.isArray(itemPreviousNode.pairedItem)) {
@@ -647,22 +677,31 @@ export class WorkflowDataProxy {
 						});
 					}
 					// `Could not resolve pairedItem as the defined node input '${itemInput}' does not exist on node '${sourceData.previousNode}'.`
-					throw createExpressionError('Can’t get data for expression', {
+					throw createExpressionError(
-						messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
+						'Can’t get data for expression',
-						description: `Item points to a node input which does not exist`,
+						{
-						causeDetailed: `The pairedItem data points to a node input ‘${itemInput}‘ which does not exist on node ‘${sourceData.previousNode}‘ (node did probably supply a wrong one)`,
+							messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
-					});
+							description: `Item points to a node input which does not exist`,
+							causeDetailed: `The pairedItem data points to a node input ‘${itemInput}‘ which does not exist on node ‘${sourceData.previousNode}‘ (node did probably supply a wrong one)`,
+						},
+						nodeBeforeLast,
+					);
 				}
 
+				nodeBeforeLast = sourceData.previousNode;
 				sourceData = taskData.source[pairedItem.input || 0] || null;
 			}
 
 			if (sourceData === null) {
 				// 'Could not resolve, proably no pairedItem exists.'
-				throw createExpressionError('Can’t get data for expression', {
+				throw createExpressionError(
-					messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
+					'Can’t get data for expression',
-					description: `Could not resolve, proably no pairedItem exists`,
+					{
-				});
+						messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
+						description: `Could not resolve, proably no pairedItem exists`,
+					},
+					nodeBeforeLast,
+				);
 			}
 
 			taskData =
@@ -682,11 +721,15 @@ export class WorkflowDataProxy {
 
 			if (pairedItem.item >= taskData.data!.main[previousNodeOutput]!.length) {
 				// `Could not resolve pairedItem as the item with the index '${pairedItem.item}' does not exist on node '${sourceData.previousNode}'.`
-				throw createExpressionError('Can’t get data for expression', {
+				throw createExpressionError(
-					messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
+					'Can’t get data for expression',
-					description: `Item points to an item which does not exist`,
+					{
-					causeDetailed: `The pairedItem data points to an item ‘${pairedItem.item}‘ which does not exist on node ‘${sourceData.previousNode}‘ (output node did probably supply a wrong one)`,
+						messageTemplate: `Can’t get data for expression under ‘%%PARAMETER%%’`,
-				});
+						description: `Item points to an item which does not exist`,
+						causeDetailed: `The pairedItem data points to an item ‘${pairedItem.item}‘ which does not exist on node ‘${sourceData.previousNode}‘ (output node did probably supply a wrong one)`,
+					},
+					nodeBeforeLast,
+				);
 			}
 
 			return taskData.data!.main[previousNodeOutput]![pairedItem.item];