@@ -0,0 +1,12 @@
+---
+'@objectstack/lint': patch
+---
+
+fix(lint): `page-field-unknown` judges each of a `record:related_list`'s bindings against its own object, so a `dataSource`-bound list no longer reports its parent-side `relationshipValueField` as missing from the child (#23207)
+
+Clause-②: no
+
+- **Child refs** (`columns`, `sort`, `filter`, `relationshipField`, `add.linkField`) resolve against the node-level `dataSource.object` when the list binds its rows that way, else against `properties.objectName`. Before, they resolved only against `properties.objectName`, so a `dataSource`-bound list's child columns went unchecked.
+- **The parent ref** (`relationshipValueField`) resolves against the list's `parentDataSource.object` when it declares one, else against the object the list inherits (its container's binding, else the page object). Before, a `dataSource`-bound list checked it against the child, which gave a false `field "…" is not a field on object "CHILD"` warning on a field of the parent.
+- **Severity is unchanged.** These findings stay warnings, so default `os validate`, `os lint` and `os build` accept every stack they accepted before. Under `--strict`, which treats warnings as errors, a `dataSource`-bound list with a misspelled child column can now fail a stack that used to pass, because that column was not checked before. To fix it, correct the column name to a field of `dataSource.object`.
+- `WalkedComponent` (from `walkPageComponents`) gains an optional `inheritedObject`: the object a component inherits before its own `dataSource.object` / `properties.object` override. `objectName` is unchanged.
@@ -143,6 +143,46 @@ describe('walkPageComponents — object binding precedence', () => {
     );
     expect(walked.map((w) => w.objectName)).toEqual(['ds_obj', 'ds_obj']);
   });
+
+  // [#23207] A component's OWN override never leaks into what it inherits:
+  // `inheritedObject` is the container's binding (else the page object), the
+  // object a `record:related_list`'s parent-side ref resolves against while
+  // its own `dataSource` binds the child rows.
+  it('reports the inherited object apart from the component\'s own override', () => {
+    const walked = walkPageComponents(
+      {
+        object: 'page_obj',
+        regions: [
+          {
+            name: 'main',
+            components: [
+              {
+                type: 'flex',
+                dataSource: { object: 'ds_obj' },
+                properties: { children: [{ type: 'leaf', dataSource: { object: 'leaf_obj' } }, { type: 'bare' }] },
+              },
+              { type: 'top', properties: { object: 'prop_obj' } },
+            ],
+          },
+        ],
+      },
+      'pages[0]',
+    );
+    expect(walked.map((w) => [w.objectName, w.inheritedObject])).toEqual([
+      ['ds_obj', 'page_obj'],
+      ['leaf_obj', 'ds_obj'],
+      ['ds_obj', 'ds_obj'],
+      ['prop_obj', 'page_obj'],
+    ]);
+  });
+
+  it('inherits nothing on a page that names no object', () => {
+    const walked = walkPageComponents(
+      { regions: [{ name: 'main', components: [{ type: 'a', dataSource: { object: 'ds_obj' } }] }] },
+      'pages[0]',
+    );
+    expect(walked.map((w) => [w.objectName, w.inheritedObject])).toEqual([['ds_obj', undefined]]);
+  });
 });
 
 describe('walkPageComponents — cycle guard', () => {
 
@@ -55,6 +55,17 @@ export interface WalkedComponent {
    * `undefined` when nothing in the chain names one.
    */
   objectName?: string;
+  /**
+   * The object this component INHERITS — its container's binding, else the
+   * page's `object` — before its own `dataSource.object` / `properties.object`
+   * override is applied. `undefined` when nothing above it names one.
+   *
+   * A rule needs it where one component carries two bindings: a
+   * `record:related_list`'s node-level `dataSource` is its CHILD rows, while
+   * its `relationshipValueField` names a field of the record it hangs off,
+   * which is this inherited object (`validate-page-field-bindings`).
+   */
+  inheritedObject?: string;
 }
 
 function isRec(v: unknown): v is AnyRec {
@@ -136,7 +147,7 @@ export function walkPageComponents(page: AnyRec, pagePath: string): WalkedCompon
     const objectName =
       strName(dataSource?.object) ?? strName(props?.object) ?? inheritedObject;
 
-    out.push({ component: node, path, objectName });
+    out.push({ component: node, path, objectName, inheritedObject });
 
     if (!props) return;
 
 
@@ -365,6 +365,155 @@ describe('validatePageFieldBindings — related lists bind the related object',
   });
 });
 
+// [#23207] A related list carries two bindings and each batch of refs is judged
+// against its own object: the node-level `dataSource` is the CHILD rows (else
+// `properties.objectName`), and `relationshipValueField` names a field of the
+// PARENT — the object the list inherits (here the page's `crm_lead`).
+describe('validatePageFieldBindings — a related list splits its child and parent bindings', () => {
+  const LIST = 'pages[0].regions[0].components[0].properties';
+  const findingsOf = (component: Record<string, unknown>) =>
+    validatePageFieldBindings({ ...baseStack(), pages: [pageWith([{ type: 'record:related_list', ...component }])] })
+      .map((f) => [f.rule, f.severity, f.path, f.message]);
+
+  it('a dataSource-bound list resolves relationshipValueField on the parent: no finding', () => {
+    // `amount` is a crm_lead (page) field and not a crm_account (child) field.
+    expect(findingsOf({
+      dataSource: { object: 'crm_account' },
+      properties: { relationshipField: 'region', relationshipValueField: 'amount', columns: ['name', 'region'] },
+    })).toEqual([]);
+  });
+
+  it('a dataSource-bound list checks its child columns against dataSource.object', () => {
+    expect(findingsOf({
+      dataSource: { object: 'crm_account' },
+      properties: { relationshipField: 'region', relationshipValueField: 'amount', columns: ['name', 'status'] },
+    })).toEqual([[
+      PAGE_FIELD_UNKNOWN,
+      'warning',
+      `${LIST}.columns[1]`,
+      expect.stringContaining('field "status" is not a field on object "crm_account"'),
+    ]]);
+  });
+
+  it('a dataSource-bound list checks sort, filter and relationshipField against the child too', () => {
+    expect(findingsOf({
+      dataSource: { object: 'crm_account' },
+      properties: {
+        relationshipField: 'ghost_fk',
+        sort: [{ field: 'ghost_sort', order: 'asc' }],
+        filter: [{ field: 'ghost_filter', operator: 'equals', value: 'x' }],
+      },
+    }).map(([, , path, message]) => [path, message])).toEqual([
+      [`${LIST}.sort[0].field`, expect.stringContaining('"ghost_sort" is not a field on object "crm_account"')],
+      [`${LIST}.filter[0].field`, expect.stringContaining('"ghost_filter" is not a field on object "crm_account"')],
+      [`${LIST}.relationshipField`, expect.stringContaining('"ghost_fk" is not a field on object "crm_account"')],
+    ]);
+  });
+
+  it('dataSource.object wins over properties.objectName for the child refs', () => {
+    expect(findingsOf({
+      dataSource: { object: 'crm_account' },
+      // `status` is on crm_lead, so naming crm_lead here must not hide the miss.
+      properties: { objectName: 'crm_lead', relationshipField: 'region', columns: ['status'] },
+    }).map(([, , path, message]) => [path, message])).toEqual([
+      [`${LIST}.columns[0]`, expect.stringContaining('"status" is not a field on object "crm_account"')],
+    ]);
+  });
+
+  it('a parent-side ref that really is missing still reports, against the parent, on both spellings', () => {
+    const expected = [[
+      PAGE_FIELD_UNKNOWN,
+      'warning',
+      `${LIST}.relationshipValueField`,
+      expect.stringContaining('field "ghost_key" is not a field on object "crm_lead"'),
+    ]];
+    expect(findingsOf({
+      dataSource: { object: 'crm_account' },
+      properties: { relationshipField: 'region', relationshipValueField: 'ghost_key' },
+    })).toEqual(expected);
+    expect(findingsOf({
+      properties: { objectName: 'crm_account', relationshipField: 'region', relationshipValueField: 'ghost_key' },
+    })).toEqual(expected);
+  });
+
+  it('control: the properties.objectName list keeps its single finding on the bad column', () => {
+    expect(findingsOf({
+      properties: { objectName: 'crm_account', relationshipField: 'region', relationshipValueField: 'amount', columns: ['status'] },
+    })).toEqual([[
+      PAGE_FIELD_UNKNOWN,
+      'warning',
+      `${LIST}.columns[0]`,
+      expect.stringContaining('field "status" is not a field on object "crm_account"'),
+    ]]);
+  });
+
+  // The parent binding `parentDataSource` (ruling B on objectui#12296): when the
+  // list declares it, the parent ref resolves on ITS object, not the page's.
+  it('a list with parentDataSource resolves relationshipValueField on that object: no finding', () => {
+    // `ext_key` is on crm_par (the declared parent) only: not on crm_lead (the
+    // page) and not on crm_account (the child rows).
+    const stack = baseStack();
+    const findings = validatePageFieldBindings({
+      objects: [...stack.objects, { name: 'crm_par', fields: { ext_key: { type: 'text' } } }],
+      pages: [pageWith([{
+        type: 'record:related_list',
+        dataSource: { object: 'crm_account' },
+        properties: { relationshipField: 'region', relationshipValueField: 'ext_key', parentDataSource: { object: 'crm_par' } },
+      }])],
+    });
+    expect(findings).toEqual([]);
+  });
+
+  it('a properties.objectName list with parentDataSource also resolves its parent ref on that object', () => {
+    // The same reading without a node-level `dataSource`: `ext_key` is on crm_par only.
+    const stack = baseStack();
+    const findings = validatePageFieldBindings({
+      objects: [...stack.objects, { name: 'crm_par', fields: { ext_key: { type: 'text' } } }],
+      pages: [pageWith([{
+        type: 'record:related_list',
+        properties: { objectName: 'crm_account', relationshipField: 'region', relationshipValueField: 'ext_key', parentDataSource: { object: 'crm_par' } },
+      }])],
+    });
+    expect(findings).toEqual([]);
+  });
+
+  it('a list with parentDataSource reports a parent ref its declared parent lacks, against that parent', () => {
+    // `amount` is a crm_lead (page) field; the declared parent crm_account lacks
+    // it, and the child rows (crm_account too) must not be what answers.
+    expect(findingsOf({
+      dataSource: { object: 'crm_account' },
+      properties: { relationshipField: 'region', relationshipValueField: 'amount', parentDataSource: { object: 'crm_account' } },
+    })).toEqual([[
+      PAGE_FIELD_UNKNOWN,
+      'warning',
+      `${LIST}.relationshipValueField`,
+      expect.stringContaining('field "amount" is not a field on object "crm_account"'),
+    ]]);
+  });
+
+  it('a list nested in a dataSource-bound container resolves its parent ref on the container object', () => {
+    const findings = validatePageFieldBindings({
+      ...baseStack(),
+      pages: [pageWith([{
+        type: 'flex',
+        dataSource: { object: 'crm_account' },
+        properties: {
+          children: [{
+            type: 'record:related_list',
+            dataSource: { object: 'crm_lead' },
+            // `region` is on crm_account (the container), not on crm_lead (the child).
+            properties: { relationshipField: 'account', relationshipValueField: 'region', columns: ['ghost'] },
+          }],
+        },
+      }])],
+    });
+    expect(findings.map((f) => [f.path, f.message])).toEqual([[
+      `${LIST}.children[0].properties.columns[0]`,
+      expect.stringContaining('"ghost" is not a field on object "crm_lead"'),
+    ]]);
+  });
+});
+
 describe('validatePageFieldBindings — binding precedence and traversal', () => {
   it('dataSource.object overrides the page object', () => {
     const findings = validatePageFieldBindings({
 
@@ -605,18 +605,29 @@ export function validatePageFieldBindings(stack: AnyRec): PageFieldFinding[] {
       );
     };
 
-    for (const { component, path, objectName } of walkPageComponents(page, `pages[${pi}]`)) {
+    for (const { component, path, objectName, inheritedObject } of walkPageComponents(page, `pages[${pi}]`)) {
       const type = strName(component.type);
       const props = isRec(component.properties) ? component.properties : undefined;
       if (!type || !props) continue;
       const where = `page "${pageName}" · ${type}`;
       const base = `${path}.properties`;
 
       if (type === RELATED_LIST_TYPE) {
+        // [#23207] A related list carries TWO object bindings, and each batch
+        // is judged against its own. The node-level `dataSource` is the CHILD
+        // rows (its published meaning: the renderer maps `dataSource.object`
+        // onto `objectName`), so it binds the child-side refs and never the
+        // parent; without it, `properties.objectName` names the child.
         const split = relatedListFieldRefs(props, base);
-        checkRefs(split.related, split.relatedObject, where);
-        // `relationshipValueField` names a field on the PARENT (page) object.
-        checkRefs(split.parent, objectName, where);
+        const dataSource = isRec(component.dataSource) ? component.dataSource : undefined;
+        checkRefs(split.related, strName(dataSource?.object) ?? split.relatedObject, where);
+        // `relationshipValueField` names a field on the PARENT — the record the
+        // list hangs off, never its own child `dataSource`. The parent is the
+        // list's own `parentDataSource.object` when it declares one (ruling B on
+        // objectui#12296, the parent binding #23134 added), else the object the
+        // list INHERITS: its container's binding, else the page object.
+        const parentDataSource = isRec(props.parentDataSource) ? props.parentDataSource : undefined;
+        checkRefs(split.parent, strName(parentDataSource?.object) ?? inheritedObject, where);
         // The add-picker resolves against its own object.
         checkRefs(split.picker, split.pickerObject, where);
         continue;