diff --git a/eclipse-scout-core/src/form/fields/smartfield/ProposalField.js b/eclipse-scout-core/src/form/fields/smartfield/ProposalField.js
index d0dc634c5ab..0bcf975c73f 100644
--- a/eclipse-scout-core/src/form/fields/smartfield/ProposalField.js
+++ b/eclipse-scout-core/src/form/fields/smartfield/ProposalField.js
@@ -1,9 +1,9 @@
 /*
- * Copyright (c) 2014-2018 BSI Business Systems Integration AG.
+ * Copyright (c) 2010-2024 BSI Business Systems Integration AG.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
+ * https://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     BSI Business Systems Integration AG - initial API and implementation
@@ -163,6 +163,7 @@ export default class ProposalField extends SmartField {
     if (this.lookupRow !== otherField.lookupRow) {
       this.setLookupRow(otherField.lookupRow);
     }
+    this.setErrorStatus(otherField.errorStatus);
     if (this.value !== otherField.value) {
       this.setValue(otherField.value);
     }
diff --git a/eclipse-scout-core/src/testing/form/fields/smartfield/proposalFieldSpecHelper.js b/eclipse-scout-core/src/testing/form/fields/smartfield/proposalFieldSpecHelper.js
new file mode 100644
index 00000000000..336757dc1d7
--- /dev/null
+++ b/eclipse-scout-core/src/testing/form/fields/smartfield/proposalFieldSpecHelper.js
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2010-2024 BSI Business Systems Integration AG.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     BSI Business Systems Integration AG - initial API and implementation
+ */
+
+import {ProposalField} from '../../../../index';
+
+export async function testProposalFieldInputs(field, inputs, touchMode, callbacks) {
+  field.touchMode = touchMode;
+  field.render();
+
+  callbacks = $.extend({
+    beforeInput: (input) => {
+    },
+    afterInput: (input) => {
+    },
+    afterSelectLookupRow: (text, lookupRow) => {
+    },
+    afterAcceptCustomText: (text) => {
+    }
+  }, callbacks);
+
+  for (const inputOrText of inputs) {
+    const input = ensureInput(inputOrText);
+    const {text, lookup} = input;
+
+    callbacks.beforeInput(input);
+
+    if (lookup) {
+      const lookupRow = await selectLookupRow(field, text);
+      callbacks.afterSelectLookupRow(text, lookupRow);
+    } else {
+      await acceptCustomText(field, text);
+      callbacks.afterAcceptCustomText(text);
+    }
+
+    callbacks.afterInput(input);
+  }
+}
+
+export function ensureInput(inputOrText) {
+  return typeof inputOrText === 'string' ? {text: inputOrText} : inputOrText;
+}
+
+export async function acceptCustomText(field, text) {
+  if (field.touchMode) {
+    // touchMode opens a popup with a field and a done-menu
+    const popup = await openPopup(field);
+    popup._field.$field.val(text);
+    popup._field.acceptInput();
+    popup.doneAction.doAction();
+  } else {
+    field.$field.val(text);
+    field.acceptInput();
+  }
+}
+
+export async function selectLookupRow(field, text) {
+  // find row for text
+  const popup = await openPopup(field);
+  const proposalChooser = field.touchMode ? popup._widget : popup.proposalChooser;
+  const table = proposalChooser.model;
+  const row = table.rows.find(r => r.cells[0].text === text);
+
+  // trigger row mousedown and mouseup
+  row.$row.triggerMouseDown();
+  row.$row.triggerMouseUp();
+
+  return row.lookupRow;
+}
+
+export async function openPopup(field) {
+  field.$field.focus();
+  await field.openPopup(true);
+  const popup = field.popup;
+  popup.animateRemoval = false;
+  return popup;
+}
+
+export function createSpecProposalField() {
+  return new SpecProposalField();
+}
+
+class SpecProposalField extends ProposalField {
+  acceptInput(sync) {
+    this._acceptInputEnabled = true; // accept all inputs, no need for a timeout
+    return super.acceptInput(sync);
+  }
+}
+
+export default {
+  testProposalFieldInputs,
+  ensureInput,
+  acceptCustomText,
+  selectLookupRow,
+  openPopup,
+  createSpecProposalField
+}
diff --git a/eclipse-scout-core/src/testing/index.js b/eclipse-scout-core/src/testing/index.js
index 17eeba942ae..f54fadee7b9 100644
--- a/eclipse-scout-core/src/testing/index.js
+++ b/eclipse-scout-core/src/testing/index.js
@@ -1,9 +1,9 @@
 /*
- * Copyright (c) 2010-2020 BSI Business Systems Integration AG.
+ * Copyright (c) 2010-2024 BSI Business Systems Integration AG.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
+ * https://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     BSI Business Systems Integration AG - initial API and implementation
@@ -23,6 +23,7 @@ export {default as TableSpecHelper} from './table/TableSpecHelper';
 export {default as FormSpecHelper} from './form/FormSpecHelper';
 export {default as CloneSpecHelper} from './form/fields/CloneSpecHelper';
 export {default as TestBeanField} from './form/fields/beanfield/TestBeanField';
+export {default as proposalFieldSpecHelper} from './form/fields/smartfield/proposalFieldSpecHelper';
 export {default as TabBoxSpecHelper} from './form/fields/tabbox/TabBoxSpecHelper';
 export {default as OutlineSpecHelper} from './desktop/outline/OutlineSpecHelper';
 export {default as DummyLookupCall} from './lookup/DummyLookupCall';
diff --git a/eclipse-scout-core/test/form/fields/smartfield/ProposalFieldAdapterSpec.js b/eclipse-scout-core/test/form/fields/smartfield/ProposalFieldAdapterSpec.js
new file mode 100644
index 00000000000..30b87510bad
--- /dev/null
+++ b/eclipse-scout-core/test/form/fields/smartfield/ProposalFieldAdapterSpec.js
@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 2010-2024 BSI Business Systems Integration AG.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     BSI Business Systems Integration AG - initial API and implementation
+ */
+import {ObjectFactory, scout, Status} from '../../../../src/index';
+import {proposalFieldSpecHelper} from '../../../../src/testing';
+
+describe('ProposalFieldAdapter', () => {
+
+  let session, field, modelAdapter;
+
+  beforeEach(() => {
+    setFixtures(sandbox());
+    session = sandboxSession();
+    ObjectFactory.get().register('SpecProposalField', () => proposalFieldSpecHelper.createSpecProposalField());
+
+    field = scout.create('SpecProposalField', {parent: session.desktop});
+    linkWidgetAndAdapter(field, 'ProposalFieldAdapter');
+    modelAdapter = field.modelAdapter;
+    field.setLookupCall(scout.create('StaticLookupCall', {
+      session: field.session,
+      data: [
+        ['foo', 'foo'],
+        ['bar', 'bar']
+      ]
+    }));
+  });
+
+  afterEach(() => {
+    ObjectFactory.get().unregister('SpecProposalField');
+  });
+
+  describe('acceptInput-event contains correct data', () => {
+    let spy;
+
+    beforeEach(() => {
+      spy = spyOn(modelAdapter, '_send');
+    });
+
+    // some > foo > bar
+
+    it('write \'some\' > write \'foo\' > write \'bar\' (touchMode: false, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['some', 'foo', 'bar'],
+        false,
+        false));
+
+    it('write \'some\' > write \'foo\' > write \'bar\' (touchMode: true, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['some', 'foo', 'bar'],
+        true,
+        false));
+
+    it('write \'some\' > write \'foo\' > write \'bar\' (touchMode: false, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['some', 'foo', 'bar'],
+        false,
+        true));
+
+    it('write \'some\' > write \'foo\' > write \'bar\' (touchMode: true, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['some', 'foo', 'bar'],
+        true,
+        true));
+
+    // foo > some > bar
+
+    it('write \'foo\' > write \'some\' > write \'bar\' (touchMode: false, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'some', 'bar'],
+        false,
+        false));
+
+    it('write \'foo\' > write \'some\' > write \'bar\' (touchMode: true, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'some', 'bar'],
+        true,
+        false));
+
+    it('write \'foo\' > write \'some\' > write \'bar\' (touchMode: false, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'some', 'bar'],
+        false,
+        true));
+
+    it('write \'foo\' > write \'some\' > write \'bar\' (touchMode: true, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'some', 'bar'],
+        true,
+        true));
+
+    // foo > bar > some
+
+    it('write \'foo\' > write \'bar\' > write \'some\' (touchMode: false, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'bar', 'some'],
+        false,
+        false));
+
+    it('write \'foo\' > write \'bar\' > write \'some\' (touchMode: true, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'bar', 'some'],
+        true,
+        false));
+
+    it('write \'foo\' > write \'bar\' > write \'some\' (touchMode: false, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'bar', 'some'],
+        false,
+        true));
+
+    it('write \'foo\' > write \'bar\' > write \'some\' (touchMode: true, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'bar', 'some'],
+        true,
+        true));
+
+    // foo > bar > some > thing
+
+    it('lookup \'foo\' > lookup \'bar\' > write \'some\' > write \'thing\' (touchMode: false, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        [{text: 'foo', lookup: true}, {text: 'bar', lookup: true}, 'some', 'thing'],
+        false,
+        false));
+
+    it('lookup \'foo\' > lookup \'bar\' > write \'some\' > write \'thing\' (touchMode: true, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        [{text: 'foo', lookup: true}, {text: 'bar', lookup: true}, 'some', 'thing'],
+        true,
+        false));
+
+    it('lookup \'foo\' > lookup \'bar\' > write \'some\' > write \'thing\' (touchMode: false, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        [{text: 'foo', lookup: true}, {text: 'bar', lookup: true}, 'some', 'thing'],
+        false,
+        true));
+
+    it('lookup \'foo\' > lookup \'bar\' > write \'some\' > write \'thing\' (touchMode: true, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        [{text: 'foo', lookup: true}, {text: 'bar', lookup: true}, 'some', 'thing'],
+        true,
+        true));
+
+    // some > thing > foo > bar
+
+    it('write \'some\' > write \'thing\' > lookup \'foo\' > lookup \'bar\' (touchMode: false, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['some', 'thing', {text: 'foo', lookup: true}, {text: 'bar', lookup: true}],
+        false,
+        false));
+
+    it('write \'some\' > write \'thing\' > lookup \'foo\' > lookup \'bar\' (touchMode: true, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['some', 'thing', {text: 'foo', lookup: true}, {text: 'bar', lookup: true}],
+        true,
+        false));
+
+    it('write \'some\' > write \'thing\' > lookup \'foo\' > lookup \'bar\' (touchMode: false, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['some', 'thing', {text: 'foo', lookup: true}, {text: 'bar', lookup: true}],
+        false,
+        true));
+
+    it('write \'some\' > write \'thing\' > lookup \'foo\' > lookup \'bar\' (touchMode: true, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['some', 'thing', {text: 'foo', lookup: true}, {text: 'bar', lookup: true}],
+        true,
+        true));
+
+    // foo > bar > foo > bar
+
+    it('lookup \'foo\' > lookup \'bar\' > write \'foo\' > write \'bar\' (touchMode: false, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        [{text: 'foo', lookup: true}, {text: 'bar', lookup: true}, 'foo', 'bar'],
+        false,
+        false));
+
+    it('lookup \'foo\' > lookup \'bar\' > write \'foo\' > write \'bar\' (touchMode: true, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        [{text: 'foo', lookup: true}, {text: 'bar', lookup: true}, 'foo', 'bar'],
+        true,
+        false));
+
+    it('lookup \'foo\' > lookup \'bar\' > write \'foo\' > write \'bar\' (touchMode: false, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        [{text: 'foo', lookup: true}, {text: 'bar', lookup: true}, 'foo', 'bar'],
+        false,
+        true));
+
+    it('lookup \'foo\' > lookup \'bar\' > write \'foo\' > write \'bar\' (touchMode: true, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        [{text: 'foo', lookup: true}, {text: 'bar', lookup: true}, 'foo', 'bar'],
+        true,
+        true));
+
+    it('write \'foo\' > write \'bar\' > lookup \'foo\' > lookup \'bar\' (touchMode: false, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'bar', {text: 'foo', lookup: true}, {text: 'bar', lookup: true}],
+        false,
+        false));
+
+    it('write \'foo\' > write \'bar\' > lookup \'foo\' > lookup \'bar\' (touchMode: true, withErrorStatus: false)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'bar', {text: 'foo', lookup: true}, {text: 'bar', lookup: true}],
+        true,
+        false));
+
+    it('write \'foo\' > write \'bar\' > lookup \'foo\' > lookup \'bar\' (touchMode: false, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'bar', {text: 'foo', lookup: true}, {text: 'bar', lookup: true}],
+        false,
+        true));
+
+    it('write \'foo\' > write \'bar\' > lookup \'foo\' > lookup \'bar\' (touchMode: true, withErrorStatus: true)', async () =>
+      await testProposalFieldInputs(
+        ['foo', 'bar', {text: 'foo', lookup: true}, {text: 'bar', lookup: true}],
+        true,
+        true));
+
+    async function testProposalFieldInputs(inputs, touchMode, withErrorStatus) {
+      const callbacks = {
+        afterInput: (input) => {
+          const {text} = input;
+          expect(field.value).toBe(text);
+          expect(field.errorStatus).toBeNull();
+        },
+        afterSelectLookupRow: (text, lookupRow) => expectAcceptInputEvent(text, lookupRow),
+        afterAcceptCustomText: (text) => expectAcceptInputEvent(text)
+      };
+
+      if (withErrorStatus) {
+        callbacks.beforeInput = (input) => field.setErrorStatus(Status.warning('I am a WARNING!'));
+      }
+
+      await proposalFieldSpecHelper.testProposalFieldInputs(field, inputs, touchMode, callbacks);
+    }
+
+    function expectAcceptInputEvent(text, lookupRow) {
+      const displayText = text;
+      const value = text;
+      let eventData = {displayText, value, errorStatus: null};
+      if (lookupRow) {
+        eventData = {...eventData, lookupRow};
+      }
+      expect(spy).toHaveBeenCalledWith('acceptInput', jasmine.objectContaining(eventData), jasmine.anything());
+    }
+  });
+});