@@ -0,0 +1,17 @@
+---
+'@object-ui/data-objectstack': patch
+'@object-ui/i18n': patch
+---
+
+fix(data-objectstack): the metadata client's layered read, item and draft reads, publish and reset name the bundle member they address
+
+Clause-②: no
+Metadata-protocol: none
+
+`MetadataClient.layered()`, `get()`, `getDraft()`, `publish()` and `reset()` take an optional `member` and send it as `?member=`, the selector the by-name doors read for a metadata type whose identity is a pair (today only `email_template`, `(name, locale)`). Omitted, every call sends exactly the URL it sent before and the door addresses the canonical member. The parameter is never sent empty.
+
+`getDraft()` with a `member` skips the draft read when the pending-drafts ledger lists that name only as another member's draft.
+
+Setup's metadata list now shows an email template's locale in its own column and links each row to its own member (`?member=LOCALE`), and the editor passes that member to its layered and draft reads and to its publish, reset and discard, so each language of a template opens and is edited on its own.
+
+`@object-ui/i18n`'s `studio` namespace gains the column's label, `engine.list.col.locale` (`Locale` / `语言`).
@@ -164,9 +164,15 @@ export async function readDraftForSave<T = unknown>(
   type: string,
   name: string,
   packageId: string | null | undefined,
+  // objectstack#26649 — the bundle member whose draft this is; omitted, the
+  // canonical member's. The save it pins is addressed by its body's member.
+  member?: string,
 ): Promise<{ answer: T | null; pin: DraftPin | null }> {
   try {
-    const answer = await client.getDraft<T>(type, name, packageId ? { packageId } : {});
+    const answer = await client.getDraft<T>(type, name, {
+      ...(packageId ? { packageId } : {}),
+      ...(member ? { member } : {}),
+    });
     return { answer, pin: draftPinOf(answer) };
   } catch {
     return { answer: null, pin: null };
 
@@ -0,0 +1,241 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * objectstack#26649 — the metadata edit page opened with `?member=` reads and
+ * writes THAT bundle member.
+ *
+ * Setup's list links each language of an `email_template` to
+ * `…/email_template/NAME?member=LOCALE`. The page forwards the member to its
+ * layered read and its draft read (ruling 6444406836), and to every by-name
+ * write it issues for the item — publish, reset and discard — because each of
+ * those doors addresses the CANONICAL member when it is named none: Reset on
+ * the `zh-CN` page would otherwise remove the `en-US` overlay.
+ *
+ * The REAL page over a REAL `MetadataClient`, whose transport is an in-memory
+ * server keyed by `(name, member)` as the framework keys a bundle (canonical
+ * member `en-US`), so a request that drops the member lands on the other
+ * language and the assertion on what is stored goes red.
+ */
+
+import '@testing-library/jest-dom/vitest';
+import * as React from 'react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { act, cleanup, fireEvent, render, screen, waitFor, within } from '@testing-library/react';
+import { MemoryRouter, Route, Routes } from 'react-router-dom';
+import { MetadataClient } from '@object-ui/data-objectstack';
+
+vi.mock('sonner', () => ({ toast: { success: vi.fn(), error: vi.fn(), info: vi.fn(), warning: vi.fn() } }));
+
+const CANONICAL = 'en-US';
+const NAME = 'duly.task_overdue';
+
+const tpl = (locale: string, subject: string) => ({
+  name: NAME,
+  label: `Overdue ${locale}`,
+  locale,
+  subject,
+  bodyHtml: `<p>${subject}</p>`,
+});
+
+/** One member's stored state, as the framework holds a bundle row. */
+interface MemberRows {
+  code: Record<string, unknown> | null;
+  overlay: Record<string, unknown> | null;
+  draft: Record<string, unknown> | null;
+}
+
+const server = {
+  members: new Map<string, MemberRows>(),
+  requests: [] as Array<{ method: string; path: string; query: URLSearchParams }>,
+};
+
+const json = (status: number, body: unknown) =>
+  new Response(JSON.stringify(body), { status, headers: { 'Content-Type': 'application/json' } });
+
+async function serve(input: RequestInfo | URL, init?: RequestInit): Promise<Response> {
+  const method = (init?.method ?? 'GET').toUpperCase();
+  const url = new URL(String(input), 'http://console.test');
+  const q = url.searchParams;
+  const meta = url.pathname.match(/^\/api\/v1\/meta\/(.+)$/);
+  if (!meta) return json(200, []);
+  const seg = meta[1].split('/').map(decodeURIComponent);
+  server.requests.push({ method, path: seg.join('/'), query: q });
+  if (seg[0] === '_drafts') {
+    return json(200, {
+      drafts: [...server.members.entries()]
+        .filter(([, rows]) => rows.draft)
+        .map(([member]) => ({ type: 'email_template', name: NAME, member, packageId: null })),
+    });
+  }
+  if (seg.length === 1) return json(200, { items: [] });
+  const member = q.get('member') ?? CANONICAL;
+  const rows = server.members.get(member);
+  if (seg.length === 3 && seg[2] === 'layers') {
+    if (!rows || (!rows.code && !rows.overlay)) return json(404, { error: { code: 'NOT_FOUND', message: 'absent' } });
+    const effective = rows.overlay ?? rows.code;
+    return json(200, {
+      code: rows.code, overlay: rows.overlay, overlayScope: rows.overlay ? 'env' : null, effective,
+      editable: true, deletable: true, resettable: !!(rows.code && rows.overlay), lock: 'none',
+    });
+  }
+  if (seg.length === 3 && seg[2] === 'references') return json(200, []);
+  if (seg.length === 3 && seg[2] === 'publish' && method === 'POST') {
+    if (!rows?.draft) return json(404, { error: { code: 'NO_DRAFT', message: 'no draft' } });
+    rows.overlay = rows.draft;
+    rows.draft = null;
+    return json(200, { success: true, version: 'sha256:1', seq: 2, message: 'published' });
+  }
+  if (seg.length === 2 && method === 'DELETE') {
+    if (rows) {
+      if (q.get('state') === 'draft') rows.draft = null;
+      else rows.overlay = null;
+    }
+    return json(200, {});
+  }
+  if (seg.length === 2 && method === 'GET') {
+    const draftRead = q.get('state') === 'draft';
+    const row = draftRead ? rows?.draft : (rows?.overlay ?? rows?.code);
+    return row
+      ? json(200, { type: 'email_template', name: NAME, item: draftRead ? { ...row, _draft: true } : row, ...(draftRead ? { version: 'sha256:d' } : {}) })
+      : json(404, { error: { code: draftRead ? 'NO_DRAFT' : 'NOT_FOUND', message: 'absent' } });
+  }
+  return json(200, {});
+}
+
+const client = vi.hoisted(() => ({ current: null as unknown }));
+
+vi.mock('./useMetadata', async (importOriginal) => {
+  const mod = await importOriginal<typeof import('./useMetadata')>();
+  return {
+    ...mod,
+    useMetadataClient: () => client.current,
+    useMetadataTypes: () => ({
+      loading: false,
+      entries: [
+        { type: 'email_template', label: 'Email Template', domain: 'system', allowEnvironmentOverlay: true, allowRuntimeCreate: true },
+      ],
+    }),
+  };
+});
+
+import { MetadataResourceEditPage } from './ResourceEditPage';
+import { registerDefaultMetadataSchemas } from './default-schemas';
+
+client.current = new MetadataClient({ baseUrl: '', fetch: vi.fn(serve) as unknown as typeof fetch });
+registerDefaultMetadataSchemas();
+
+beforeEach(() => {
+  server.members.clear();
+  server.requests.length = 0;
+  server.members.set(CANONICAL, { code: tpl(CANONICAL, 'Overdue'), overlay: null, draft: null });
+  server.members.set('zh-CN', {
+    code: tpl('zh-CN', '逾期'),
+    overlay: tpl('zh-CN', '逾期了'),
+    draft: tpl('zh-CN', '逾期了，请处理'),
+  });
+  window.localStorage.setItem('metadata-admin:autosave', '0');
+  Object.defineProperty(window, 'confirm', { configurable: true, writable: true, value: vi.fn(() => true) });
+});
+afterEach(() => {
+  cleanup();
+  window.localStorage.removeItem('metadata-admin:autosave');
+});
+
+async function settle() {
+  await act(async () => {
+    for (let i = 0; i < 20; i++) await new Promise((r) => setTimeout(r, 0));
+  });
+}
+
+function renderEdit(search: string) {
+  render(
+    <MemoryRouter initialEntries={[`/metadata/email_template/${NAME}${search}`]}>
+      <Routes>
+        <Route path="/metadata/email_template/:name" element={<MetadataResourceEditPage type="email_template" name={NAME} />} />
+      </Routes>
+    </MemoryRouter>,
+  );
+}
+
+/** The requests to one door: `layers`, `publish`, the draft read, or a DELETE. */
+const sent = (pick: (r: (typeof server.requests)[number]) => boolean) => server.requests.filter(pick);
+const layerReads = () => sent((r) => r.path.endsWith('/layers'));
+const draftReads = () => sent((r) => r.method === 'GET' && r.query.get('state') === 'draft');
+
+async function confirmDialog() {
+  const dialog = await screen.findByRole('alertdialog');
+  fireEvent.click(within(dialog).getByTestId('resource-edit-confirm-action'));
+}
+
+describe('MetadataResourceEditPage — ?member= opens that bundle member (objectstack#26649)', () => {
+  it('reads the member\'s layers and draft, and shows its own body', async () => {
+    renderEdit('?scope=environment&member=zh-CN');
+    expect(await screen.findByDisplayValue('逾期了，请处理', undefined, { timeout: 8000 })).toBeInTheDocument();
+    await settle();
+
+    expect(layerReads().length).toBeGreaterThan(0);
+    for (const r of layerReads()) expect(r.query.get('member')).toBe('zh-CN');
+    expect(draftReads().length).toBeGreaterThan(0);
+    for (const r of draftReads()) expect(r.query.get('member')).toBe('zh-CN');
+    expect(screen.queryByDisplayValue('Overdue')).not.toBeInTheDocument();
+  });
+
+  it('CONTROL: with no ?member= the page reads the canonical member and sends no selector', async () => {
+    renderEdit('?scope=environment');
+    expect(await screen.findByDisplayValue('Overdue', undefined, { timeout: 8000 })).toBeInTheDocument();
+    await settle();
+
+    for (const r of server.requests) expect(r.query.has('member')).toBe(false);
+  });
+
+  it('Publish promotes the opened member\'s draft, not the canonical member\'s', async () => {
+    renderEdit('?scope=environment&member=zh-CN');
+    await screen.findByDisplayValue('逾期了，请处理', undefined, { timeout: 8000 });
+    await settle();
+
+    fireEvent.click(screen.getByTitle('Publish'));
+    await waitFor(() => expect(server.members.get('zh-CN')!.draft).toBeNull());
+    await settle();
+
+    const publishes = sent((r) => r.path.endsWith('/publish'));
+    expect(publishes).toHaveLength(1);
+    expect(publishes[0]!.query.get('member')).toBe('zh-CN');
+    expect(server.members.get('zh-CN')!.overlay).toMatchObject({ subject: '逾期了，请处理' });
+  });
+
+  it('Discard draft discards the opened member\'s draft', async () => {
+    renderEdit('?scope=environment&member=zh-CN');
+    await screen.findByDisplayValue('逾期了，请处理', undefined, { timeout: 8000 });
+    await settle();
+
+    fireEvent.click(screen.getAllByTitle('Discard draft')[0]!);
+    await confirmDialog();
+    await waitFor(() => expect(server.members.get('zh-CN')!.draft).toBeNull());
+
+    const deletes = sent((r) => r.method === 'DELETE');
+    expect(deletes).toHaveLength(1);
+    expect(deletes[0]!.query.get('state')).toBe('draft');
+    expect(deletes[0]!.query.get('member')).toBe('zh-CN');
+  });
+
+  it('Reset removes the opened member\'s overlay and leaves the other language alone', async () => {
+    server.members.get('zh-CN')!.draft = null;
+    server.members.get(CANONICAL)!.overlay = tpl(CANONICAL, 'Overdue, customised');
+    renderEdit('?scope=environment&member=zh-CN');
+    await screen.findByDisplayValue('逾期了', undefined, { timeout: 8000 });
+    await settle();
+
+    fireEvent.click(screen.getByTestId('reset-or-delete-button'));
+    await confirmDialog();
+    await waitFor(() => expect(server.members.get('zh-CN')!.overlay).toBeNull());
+    await settle();
+
+    const deletes = sent((r) => r.method === 'DELETE');
+    expect(deletes).toHaveLength(1);
+    expect(deletes[0]!.query.get('member')).toBe('zh-CN');
+    expect(server.members.get(CANONICAL)!.overlay).toMatchObject({ subject: 'Overdue, customised' });
+    // The re-read after the reset is the same member's layers.
+    expect(layerReads().at(-1)!.query.get('member')).toBe('zh-CN');
+    expect(await screen.findByDisplayValue('逾期')).toBeInTheDocument();
+  });
+});
@@ -125,6 +125,7 @@ import {
 // objectui#11773 — the draft save's optimistic-concurrency guard and its dialog.
 import { readDraftForSave, useDraftSaveGuard } from './DraftConflictDialog.js';
 import {
+  BUNDLE_MEMBER_PARAM,
   getMetadataResource,
   resolveResourceConfig,
   listAnchorsFor,
@@ -498,6 +499,13 @@ function MetadataResourceEditPageImpl({
   // package's item. NOT the active Studio app's package — Studio edits items
   // across all installed packages.
   const ownerPackageId = searchParams.get('package') ?? undefined;
+  // objectstack#26649 — the bundle member this page edits, carried on the edit
+  // URL as `?member=` by the list's row link (`bundleMemberField`): every
+  // by-name read and write below addresses it, so two locales of one template
+  // open, publish, reset and discard as two items. Absent (never empty) for
+  // the canonical member and for a type with no members.
+  const bundleMember = searchParams.get(BUNDLE_MEMBER_PARAM) || undefined;
+  const memberScope = bundleMember ? { member: bundleMember } : {};
   const client = useMetadataClient();
   const { entries, loading: typesLoading } = useMetadataTypes(client);
   const entry: RichMetadataTypeEntry | undefined = entries.find((t) => t.type === type);
@@ -1167,7 +1175,10 @@ function MetadataResourceEditPageImpl({
     setLoadFailed(false);
     (async () => {
       try {
-        const scope = ownerPackageId ? { packageId: ownerPackageId } : {};
+        const scope = {
+          ...(ownerPackageId ? { packageId: ownerPackageId } : {}),
+          ...(bundleMember ? { member: bundleMember } : {}),
+        };
         // objectui#11773 — the draft is read at the address `doSave` writes
         // (`readActivePackageBinding`, the folded `?package=`), so the version
         // it serves is the one that save compares against.
@@ -1177,7 +1188,7 @@ function MetadataResourceEditPageImpl({
           // Draft reads are best-effort — a 404/error must not block
           // the page; readers without overlay-write permission still
           // see the published item.
-          readDraftForSave<any>(client, type, name, draftPackage),
+          readDraftForSave<any>(client, type, name, draftPackage, bundleMember),
         ]);
         if (cancelled) return;
         const draftResp = draftRead.answer;
@@ -1250,7 +1261,7 @@ function MetadataResourceEditPageImpl({
     return () => {
       cancelled = true;
     };
-  }, [client, type, name, ownerPackageId, createMode, reloadKey, locale, recordDraftRead]);
+  }, [client, type, name, ownerPackageId, bundleMember, createMode, reloadKey, locale, recordDraftRead]);
 
   // Lazy-load references the first time the References sheet opens.
   //
@@ -1787,7 +1798,7 @@ function MetadataResourceEditPageImpl({
       // Refresh layered + draft state after save — scope to the same package
       // as the initial load (ADR-0048) so a same-name collision re-reads this
       // package's own row, not another's.
-      const refreshScope = ownerPackageId ? { packageId: ownerPackageId } : {};
+      const refreshScope = { ...(ownerPackageId ? { packageId: ownerPackageId } : {}), ...memberScope };
       // objectui#11799 — this save went into a draft, which makes no layer. An
       // item this page loaded with no layer still has none, and an item it
       // just created has never been published (the page then navigates to the
@@ -1982,12 +1993,13 @@ function MetadataResourceEditPageImpl({
       const activePackage = readActivePackageBinding();
       await client.reset(type, name, {
         ...(activePackage ? { packageId: activePackage } : {}),
+        ...memberScope,
       });
       // objectui#11773 — the buffer below is re-read from the layers, with no
       // draft read behind it, so nothing pins its next save.
       forgetDraftVersion();
       if (resetSemantic) {
-        const lay = await client.layered<any>(type, name);
+        const lay = await client.layered<any>(type, name, memberScope);
         setLayered(lay);
         const fresh = (lay.effective ?? lay.code ?? {}) as Record<string, unknown>;
         setDraft(fresh);
@@ -2025,12 +2037,13 @@ function MetadataResourceEditPageImpl({
       const activePackage = readActivePackageBinding();
       await client.publish<any>(type, name, {
         ...(activePackage ? { packageId: activePackage } : {}),
+        ...memberScope,
       });
       // objectui#11773 — the draft is re-read at the address the next save
       // writes, so its answer pins that save (see the load effect).
       const [lay, draftRead] = await Promise.all([
-        client.layered<any>(type, name),
-        readDraftForSave<any>(client, type, name, activePackage),
+        client.layered<any>(type, name, memberScope),
+        readDraftForSave<any>(client, type, name, activePackage, bundleMember),
       ]);
       const draftResp = draftRead.answer;
       setLayered(lay);
@@ -2087,13 +2100,14 @@ function MetadataResourceEditPageImpl({
       await client.reset(type, name, {
         state: 'draft',
         ...(activePackage ? { packageId: activePackage } : {}),
+        ...memberScope,
       });
       // objectui#11773 — the discard dropped the draft the held version named,
       // and no draft read follows it: nothing pins the next save.
       forgetDraftVersion();
       // objectui#11799 — a discard makes no layer: an item this page loaded
       // with no layer still has none, and `/layers` would answer 404.
-      const lay = layered && holdsNoLayer(layered) ? layered : await client.layered<any>(type, name);
+      const lay = layered && holdsNoLayer(layered) ? layered : await client.layered<any>(type, name, memberScope);
       setLayered(lay);
       const fresh = (lay.effective ?? lay.code ?? {}) as Record<string, unknown>;
       setDraft(fresh);