@@ -0,0 +1,14 @@
+---
+'@object-ui/components': patch
+'@object-ui/plugin-grid': patch
+---
+
+fix(ui): a refused inline-grid save marks its cells and says every reason; a refused form save is said once
+
+Clause-②: no
+Metadata-protocol: none
+
+- **Inline grid edit, Save All.** When the server refused a row, the save bar showed one shortened line, with the rest only in a tooltip, and no cell showed which value was wrong. Now every reason is shown in full on its own line under the toolbar, and each cell the refusal names gets a red outline with its reason on hover. Editing a marked cell removes its outline.
+- **Field rules before sending.** The grid's built-in saves now check an edited value against the field's own rules (required, min / max, length, email / URL pattern) before sending, and refuse a row that breaks one in the same way the server would. That row is not sent; the other rows still save.
+- **Save All placement.** The grid toolbar is padded, so the Save All / Cancel All buttons no longer sit against the right edge of the grid.
+- **Refused form save.** When the server refused a form save, such as one blocked by a validation rule on a Studio-authored object, the form showed a banner and an identical error toast. It now shows the banner only, scrolled into view, and a retry still replaces that banner instead of adding another. This reverses the earlier one-error-toast behaviour.
@@ -0,0 +1,160 @@
+/**
+ * ObjectUI
+ * Copyright (c) 2024-present ObjectStack Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * objectstack-ai/objectstack#27520 (row 6) — a refused inline save says WHY,
+ * WHERE: the save bar says every reason whole, one line each, and the cells
+ * the refusal names are marked.
+ *
+ * The server refuses a row field by field (`VALIDATION_FAILED` with one
+ * `fields[]` entry per failed rule). The save bar used to cut that to one
+ * truncated line, the rest only in a native tooltip, and no cell said which
+ * value was wrong.
+ */
+import { describe, it, expect, vi } from 'vitest';
+import { fireEvent, waitFor, within } from '@testing-library/react';
+import '@testing-library/jest-dom';
+import { renderComponent } from './test-utils';
+// Registers the renderers at module scope, NOT inside a `beforeAll`; see
+// object-ui/no-dynamic-import-in-test-hook (objectui#3010/#3021).
+import '../renderers';
+
+const schema = {
+  type: 'data-table' as const,
+  editable: true,
+  singleClickEdit: true,
+  columns: [
+    { header: 'Title', accessorKey: 'title' },
+    { header: 'Estimate', accessorKey: 'estimate', type: 'number' },
+  ],
+  data: [
+    { id: '1', title: 'Ingest pipeline', estimate: 60 },
+    { id: '2', title: 'Warehouse schema', estimate: 33 },
+  ],
+} as any;
+
+type Entry = { rowIndex: number; changes: Record<string, any>; row: any };
+
+const TITLE = 'Title is required and cannot be cleared';
+const ESTIMATE = 'Estimate (h) must be ≥ 0';
+
+/** The refusal `PATCH /data/:object/:id` answers, as `@objectstack/client` decorates it. */
+function fieldRefusal(fields: Array<{ field: string; message: string }>) {
+  const message = fields.map((f) => f.message).join('; ');
+  return Object.assign(new Error(message), {
+    code: 'VALIDATION_FAILED',
+    httpStatus: 400,
+    details: { error: message, code: 'VALIDATION_FAILED', fields: fields.map((f) => ({ ...f, code: 'invalid' })) },
+  });
+}
+
+const cellOf = (container: HTMLElement, rowNumber: number, colNumber: number) =>
+  container.querySelectorAll('tbody tr')[rowNumber].querySelectorAll('td')[colNumber] as HTMLElement;
+
+/** Stage a new value in a body cell. */
+function stage(container: HTMLElement, rowNumber: number, colNumber: number, value: string) {
+  const cell = cellOf(container, rowNumber, colNumber);
+  fireEvent.click(cell);
+  const input = cell.querySelector('input') as HTMLInputElement;
+  fireEvent.change(input, { target: { value } });
+  fireEvent.blur(input);
+}
+
+const refusalBar = (container: HTMLElement) =>
+  container.querySelector('[data-testid="table-save-refusal"]') as HTMLElement | null;
+
+describe('data-table — a refused save says every reason and marks its cells (#27520)', () => {
+  it('Save All: one line per reason, whole, and the two named cells of the refused row marked', async () => {
+    const onBatchSave = vi.fn(async (entries: Entry[]) => ({
+      failed: entries
+        .filter((e) => e.row.id === '1')
+        .map((e) => ({
+          rowIndex: e.rowIndex,
+          error: fieldRefusal([{ field: 'title', message: TITLE }, { field: 'estimate', message: ESTIMATE }]),
+        })),
+    }));
+    const { container, getByText } = renderComponent({ ...schema, onBatchSave });
+
+    stage(container, 0, 0, '');
+    stage(container, 0, 1, '-5');
+    stage(container, 1, 1, '31');
+    fireEvent.click(getByText(/Save All/));
+
+    await waitFor(() => expect(refusalBar(container)).not.toBeNull());
+    const bar = refusalBar(container)!;
+    expect(bar).toHaveAttribute('role', 'alert');
+    expect(within(bar).getAllByRole('listitem').map((li) => li.textContent)).toEqual([TITLE, ESTIMATE]);
+    // Said whole: not the `; `-joined summary, and not cut.
+    expect(bar.textContent).not.toContain('; ');
+    expect(bar.querySelector('.truncate')).toBeNull();
+
+    // The refused row's two cells carry their reasons; the saved row's none.
+    expect(cellOf(container, 0, 0)).toHaveAttribute('aria-invalid', 'true');
+    expect(cellOf(container, 0, 0)).toHaveAttribute('data-cell-error', TITLE);
+    expect(cellOf(container, 0, 1)).toHaveAttribute('aria-invalid', 'true');
+    expect(cellOf(container, 0, 1)).toHaveAttribute('data-cell-error', ESTIMATE);
+    expect(container.querySelectorAll('tbody tr')[1].querySelector('[aria-invalid="true"]')).toBeNull();
+  });
+
+  it('editing a marked cell takes its mark away and leaves the other', async () => {
+    const onBatchSave = vi.fn(async (entries: Entry[]) => ({
+      failed: entries.map((e) => ({
+        rowIndex: e.rowIndex,
+        error: fieldRefusal([{ field: 'title', message: TITLE }, { field: 'estimate', message: ESTIMATE }]),
+      })),
+    }));
+    const { container, getByText } = renderComponent({ ...schema, onBatchSave });
+
+    stage(container, 0, 0, '');
+    stage(container, 0, 1, '-5');
+    fireEvent.click(getByText(/Save All/));
+    await waitFor(() => expect(cellOf(container, 0, 1)).toHaveAttribute('aria-invalid', 'true'));
+
+    stage(container, 0, 1, '5');
+
+    await waitFor(() => expect(cellOf(container, 0, 1)).not.toHaveAttribute('aria-invalid'));
+    expect(cellOf(container, 0, 0)).toHaveAttribute('aria-invalid', 'true');
+  });
+
+  it('a single-row save marks the cell its refusal names, and a later save that lands clears it', async () => {
+    const onRowSave = vi
+      .fn()
+      .mockRejectedValueOnce(fieldRefusal([{ field: 'estimate', message: ESTIMATE }]))
+      .mockResolvedValueOnce(undefined);
+    // `rowActions` draws the edit column that holds the row's own save button.
+    const { container } = renderComponent({ ...schema, rowActions: true, onRowSave });
+
+    stage(container, 0, 1, '-5');
+    // The row's own save button (the edit column's save icon).
+    const saveRow = () =>
+      fireEvent.click(within(container.querySelectorAll('tbody tr')[0] as HTMLElement).getByTitle(/^Save row$/i));
+    saveRow();
+
+    await waitFor(() => expect(cellOf(container, 0, 1)).toHaveAttribute('data-cell-error', ESTIMATE));
+    expect(refusalBar(container)?.textContent).toContain(ESTIMATE);
+
+    stage(container, 0, 1, '5');
+    saveRow();
+    await waitFor(() => expect(onRowSave).toHaveBeenCalledTimes(2));
+    await waitFor(() => expect(container.querySelector('tbody [aria-invalid="true"]')).toBeNull());
+  });
+
+  it('a whole-batch rejection says its reasons but marks no cell: no row is named', async () => {
+    const onBatchSave = vi.fn(async () => {
+      throw fieldRefusal([{ field: 'title', message: TITLE }]);
+    });
+    const { container, getByText } = renderComponent({ ...schema, onBatchSave });
+
+    stage(container, 0, 0, '');
+    stage(container, 1, 1, '31');
+    fireEvent.click(getByText(/Save All/));
+
+    await waitFor(() => expect(refusalBar(container)?.textContent).toContain(TITLE));
+    expect(container.querySelector('tbody [aria-invalid="true"]')).toBeNull();
+  });
+});