diff --git a/.changeset/13178-stripped-stored-expression.md b/.changeset/13178-stripped-stored-expression.md
new file mode 100644
index 0000000000..4836be5503
--- /dev/null
+++ b/.changeset/13178-stripped-stored-expression.md
@@ -0,0 +1,25 @@
+---
+'@object-ui/app-shell': patch
+'@object-ui/i18n': patch
+---
+
+fix(app-shell): the save warning has a sentence of its own for a value a stored expression replaced
+
+objectstack-ai/objectstack#24778 gives the write path a fifth strip reason,
+`stored_expression`: a stored field whose declared expression the engine computes
+on every write keeps the computed value, not the one the caller sent. The save
+warning words that reason as what it is — "Computed from the record, so the
+computed value was saved instead of the one sent: …" — through a new
+`detail.writeStrippedStoredExpression` key in all ten locale packs, and never as
+a read-only lock.
+
+The reason table stays exhaustive over the spec's union, widened ahead by the one
+literal so it compiles both against the published `@objectstack/spec` (which does
+not name the arm yet) and against objectstack's own spec, which the objectstack
+Console Pin Gate builds this package with.
+
+When the sentence reaches a user: the adapter judges a reported reason against
+the spec release this bundle is built with, so until that release declares
+`stored_expression` such a report is still shown as "Not applied by the server: …"
+— truthful, but without the cause. The new sentence is used from the spec release
+that declares the arm on.
diff --git a/packages/app-shell/src/providers/writeWarningToast.test.ts b/packages/app-shell/src/providers/writeWarningToast.test.ts
index 5616f310d9..1814f10ae7 100644
--- a/packages/app-shell/src/providers/writeWarningToast.test.ts
+++ b/packages/app-shell/src/providers/writeWarningToast.test.ts
@@ -38,6 +38,7 @@ import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { DroppedFieldsEventSchema } from '@objectstack/spec/data';
 import { emitWriteWarning, type WriteWarningSink } from './writeWarningToast';
 import { ObjectStackAdapter } from '@object-ui/data-objectstack';
+import { createI18n, loadBuiltInLocale, type TranslateFn } from '@object-ui/i18n';
 import type { DroppedFieldsEvent, WriteWarningEvent } from '@object-ui/data-objectstack';
 
 /** Stand-in for i18next: returns the caller's English default, interpolated. */
@@ -206,6 +207,73 @@ describe('emitWriteWarning (#3484)', () => {
     expect(calls[0].description).not.toMatch(/^Not applied by the server/);
   });
 
+  /**
+   * The `stored_expression` row (objectui#13178), driven through the REAL
+   * catalogues rather than the defaultValue stand-in, so the pin is the line a
+   * user reads in each language. Spelled through `string`: the published spec
+   * pin does not declare the arm yet (objectstack-ai/objectstack#24778 adds it),
+   * and this file has to compile against both.
+   */
+  it('words reason `stored_expression` as a computed value saved in place of the one sent, in en and zh (objectui#13178)', async () => {
+    const storedExpression: string = 'stored_expression';
+    expect(await loadBuiltInLocale('zh')).not.toBeNull();
+
+    const lines = new Map<string, string>();
+    for (const language of ['en', 'zh']) {
+      const i18n = createI18n({ defaultLanguage: language, detectBrowserLanguage: false });
+      await i18n.changeLanguage(language);
+      const keys: string[] = [];
+      const realT: TranslateFn = (key: string, opts?: Record<string, unknown>) => {
+        keys.push(key);
+        return String(i18n.t(key, opts));
+      };
+      const { sink, calls } = makeSink();
+
+      await emitWriteWarning(
+        {
+          ...EVENT,
+          droppedFields: [
+            {
+              object: 'andon',
+              fields: ['type', 'source_method'],
+              reason: storedExpression as DroppedFieldsEvent['reason'],
+            },
+          ],
+        },
+        realT,
+        adapter as never,
+        identityLabel,
+        sink,
+      );
+
+      expect(keys).toContain('detail.writeStrippedStoredExpression');
+      expect(calls).toHaveLength(1);
+      lines.set(language, calls[0].description ?? '');
+    }
+
+    expect(lines.get('en')).toBe(
+      'Computed from the record, so the computed value was saved instead of the one sent: Andon type, Source method',
+    );
+    expect(lines.get('zh')).toBe(
+      '以下字段的值由记录计算得出，已保存计算值而非提交的值：Andon type, Source method',
+    );
+  });
+
+  /**
+   * The tripwire for the `| 'stored_expression'` widening on `STRIPPED_LINE`
+   * (objectui#13178). It exists only because the published pin predates
+   * objectstack-ai/objectstack#24778; on the bump to a release that declares the
+   * arm it is a silent no-op, which no compiler reports. This makes that bump
+   * say so instead, in the suite a bump is run through.
+   */
+  it('reminds the pin bump that carries `stored_expression` to retire the widening (objectui#13178)', () => {
+    expect(
+      DroppedFieldsEventSchema.shape.reason.options,
+      "the spec pin now declares `stored_expression`: delete `| 'stored_expression'` from STRIPPED_LINE's key type " +
+        "and make spec-symbol-batch6.test.ts's `_ReasonIsTheEnum` pin the five-member union",
+    ).not.toContain('stored_expression');
+  });
+
   it('keeps one line per reason when a save was stripped for several', async () => {
     const { sink, calls } = makeSink();
 
@@ -235,7 +303,8 @@ describe('emitWriteWarning (#3484)', () => {
    * The exhaustiveness pin (objectui#3935), read off the SPEC rather than a hand
    * list that would drift: `STRIPPED_LINE` is keyed by
    * `DroppedFieldsEvent['reason']` (widened by `'computed'` from objectui#11206
-   * until the 17.6.0 bump, objectui#11438), so a missing key is a type error — but
+   * until the 17.6.0 bump, objectui#11438, and by `'stored_expression'` from
+   * objectui#13178 until the bump that declares it), so a missing key is a type error — but
    * `type-check` and `vitest` are different gates,
    * and the reason the ternary this replaced survived so long is that nothing in
    * the test suite could see the gap at all.
@@ -244,10 +313,15 @@ describe('emitWriteWarning (#3484)', () => {
    * spec declares and require each to produce its own sentence rather than the
    * skew wording. A pin bump that widens the enum makes this red next to the
    * compile error, in the gate a wording change is normally noticed in.
+   *
+   * The reasons driven are the installed spec's PLUS `stored_expression`, which
+   * the table carries ahead of the pin (objectui#13178): until the pin declares
+   * it, nothing else here would require that row to be worded distinctly.
    */
   it('gives every reason the pinned spec declares its own wording (#3935)', async () => {
-    const reasons = DroppedFieldsEventSchema.shape.reason.options;
-    expect(reasons).toContain('primary_key');
+    const declared: readonly string[] = DroppedFieldsEventSchema.shape.reason.options;
+    expect(declared).toContain('primary_key');
+    const reasons = [...new Set([...declared, 'stored_expression'])] as DroppedFieldsEvent['reason'][];
 
     const wordings = new Map<string, string>();
     for (const reason of reasons) {
diff --git a/packages/app-shell/src/providers/writeWarningToast.ts b/packages/app-shell/src/providers/writeWarningToast.ts
index 3b249b964d..5e4d1f9dd7 100644
--- a/packages/app-shell/src/providers/writeWarningToast.ts
+++ b/packages/app-shell/src/providers/writeWarningToast.ts
@@ -122,9 +122,27 @@ type StrippedLine = (t: TranslateFn, fields: string) => string;
  * so the key type was widened by `| 'computed'` to compile against both. Since
  * `@objectstack/spec` 17.6.0 the pin's own union carries `computed`, so the
  * widening was a no-op and was deleted at that bump (objectui#11438), as its
- * tripwire asked. The key type is the spec union again, exact in both directions.
+ * tripwire asked.
+ *
+ * ⭐ The key type is widened AHEAD again, by `| 'stored_expression'`, for the same
+ * reason and in the same spelling (objectui#13178). objectstack-ai/objectstack#24778
+ * adds a fifth arm, `stored_expression`: a stored field whose declared expression
+ * the engine computes on every write, so the value the caller sent was replaced
+ * by the computed one (the field IS written, unlike `computed`). The objectstack
+ * Console Pin Gate builds this package against objectstack's own spec at the
+ * objectui commit objectstack pins, so the row has to exist here before that
+ * change can land there, while the published pin this repository builds against
+ * does not declare the arm yet. The union with the literal makes the required
+ * key set the same on both sides (the pin's four plus `stored_expression`, or
+ * the five the wider spec declares), and an excess-key error cannot arise on
+ * either; the NEXT arm upstream adds is still a missing key here.
+ *
+ * Tripwire: when the pin reaches a release that declares `stored_expression`,
+ * the `| 'stored_expression'` is a silent no-op and is deleted at that bump,
+ * which makes the key type the spec union again, exact in both directions.
+ * `writeWarningToast.test.ts` fails on that bump to say so.
  */
-const STRIPPED_LINE: Record<DroppedFieldsEvent['reason'], StrippedLine> = {
+const STRIPPED_LINE: Record<DroppedFieldsEvent['reason'] | 'stored_expression', StrippedLine> = {
   readonly: (t: TranslateFn, fields: string) =>
     t('detail.writeStrippedReadonly', {
       fields,
@@ -150,6 +168,14 @@ const STRIPPED_LINE: Record<DroppedFieldsEvent['reason'], StrippedLine> = {
       defaultValue:
         'Calculated by the server from a formula, so the value sent did not take effect: {{fields}}',
     }),
+  // Not a strip in the `computed` sense: the field is stored, but with the value
+  // its expression computes from the record, never the one the caller sent.
+  stored_expression: (t: TranslateFn, fields: string) =>
+    t('detail.writeStrippedStoredExpression', {
+      fields,
+      defaultValue:
+        'Computed from the record, so the computed value was saved instead of the one sent: {{fields}}',
+    }),
 };
 
 /**
diff --git a/packages/i18n/src/locales/ar.ts b/packages/i18n/src/locales/ar.ts
index 2cce073f4c..18b164c189 100644
--- a/packages/i18n/src/locales/ar.ts
+++ b/packages/i18n/src/locales/ar.ts
@@ -1349,6 +1349,7 @@ const ar = {
     writeStrippedByState: "غير قابلة للتعديل في الحالة الحالية لهذا السجل، لذلك لم تُطبَّق: {{fields}}",
     writeStrippedPrimaryKey: "معرّف السجل لا يمكن تغييره عند الحفظ، لذلك لم تُطبَّق: {{fields}}",
     writeStrippedComputed: "يحسبها الخادم بواسطة صيغة، لذلك لم تُطبَّق القيمة المُرسَلة: {{fields}}",
+    writeStrippedStoredExpression: "تُحسب من السجل، لذلك حُفظت القيمة المحسوبة بدلًا من القيمة المُرسَلة: {{fields}}",
     writeStrippedUnknownReason: "لم تُطبَّق من قِبل الخادم: {{fields}}",
     approvalPendingEditable: "قيد الموافقة · قابل للتعديل",
     approvalPendingTooltip: "يحتوي هذا السجل على طلب موافقة معلق، لكن هذه الخطوة لا تزال تسمح بالتعديل",
diff --git a/packages/i18n/src/locales/de.ts b/packages/i18n/src/locales/de.ts
index 7fb9c7dc18..8804515613 100644
--- a/packages/i18n/src/locales/de.ts
+++ b/packages/i18n/src/locales/de.ts
@@ -1207,6 +1207,7 @@ const de = {
     writeStrippedByState: "Im aktuellen Status dieses Datensatzes nicht bearbeitbar und daher nicht übernommen: {{fields}}",
     writeStrippedPrimaryKey: "Die Kennung des Datensatzes kann beim Speichern nicht geändert werden und wurde daher nicht übernommen: {{fields}}",
     writeStrippedComputed: "Wird vom Server per Formel berechnet, daher wurde der gesendete Wert nicht übernommen: {{fields}}",
+    writeStrippedStoredExpression: "Wird aus dem Datensatz berechnet, daher wurde statt des gesendeten Werts der berechnete gespeichert: {{fields}}",
     writeStrippedUnknownReason: "Vom Server nicht übernommen: {{fields}}",
     approvalPendingEditable: "In Genehmigung · bearbeitbar",
     approvalPendingTooltip: "Dieser Datensatz hat eine ausstehende Genehmigungsanfrage; dieser Schritt erlaubt weiterhin die Bearbeitung",
diff --git a/packages/i18n/src/locales/en.ts b/packages/i18n/src/locales/en.ts
index bbc2ad760d..e5ea9cb44c 100644
--- a/packages/i18n/src/locales/en.ts
+++ b/packages/i18n/src/locales/en.ts
@@ -1328,6 +1328,7 @@ const en = {
     writeStrippedByState: "Not editable in this record's current state, so it did not take effect: {{fields}}",
     writeStrippedPrimaryKey: "The record's identifier cannot be changed by a save, so it did not take effect: {{fields}}",
     writeStrippedComputed: 'Calculated by the server from a formula, so the value sent did not take effect: {{fields}}',
+    writeStrippedStoredExpression: 'Computed from the record, so the computed value was saved instead of the one sent: {{fields}}',
     writeStrippedUnknownReason: 'Not applied by the server: {{fields}}',
     approvalPendingEditable: 'In approval · editable',
     approvalPendingTooltip: 'This record has a pending approval request; this step still allows editing',
diff --git a/packages/i18n/src/locales/es.ts b/packages/i18n/src/locales/es.ts
index e0f8dd5b68..12dc7be349 100644
--- a/packages/i18n/src/locales/es.ts
+++ b/packages/i18n/src/locales/es.ts
@@ -1244,6 +1244,7 @@ const es = {
     writeStrippedByState: "No editable en el estado actual de este registro, por lo que no se aplicó: {{fields}}",
     writeStrippedPrimaryKey: "El identificador del registro no se puede cambiar al guardar, por lo que no se aplicó: {{fields}}",
     writeStrippedComputed: "Lo calcula el servidor mediante una fórmula, por lo que el valor enviado no se aplicó: {{fields}}",
+    writeStrippedStoredExpression: "Se calcula a partir del registro, por lo que se guardó el valor calculado en lugar del enviado: {{fields}}",
     writeStrippedUnknownReason: "No aplicado por el servidor: {{fields}}",
     approvalPendingEditable: "En aprobación · editable",
     approvalPendingTooltip: "Este registro tiene una solicitud de aprobación pendiente; este paso todavía permite la edición",
diff --git a/packages/i18n/src/locales/fr.ts b/packages/i18n/src/locales/fr.ts
index 6b68e15391..50eaf5bd7f 100644
--- a/packages/i18n/src/locales/fr.ts
+++ b/packages/i18n/src/locales/fr.ts
@@ -1241,6 +1241,7 @@ const fr = {
     writeStrippedByState: "Non modifiable dans l'état actuel de cet enregistrement, donc non appliqué : {{fields}}",
     writeStrippedPrimaryKey: "L'identifiant de l'enregistrement ne peut pas être modifié lors d'un enregistrement, donc non appliqué : {{fields}}",
     writeStrippedComputed: "Calculé par le serveur à partir d'une formule, donc la valeur envoyée n'a pas été appliquée : {{fields}}",
+    writeStrippedStoredExpression: "Calculé à partir de l'enregistrement, donc la valeur calculée a été enregistrée à la place de celle envoyée : {{fields}}",
     writeStrippedUnknownReason: "Non appliqué par le serveur : {{fields}}",
     approvalPendingEditable: "En approbation · modifiable",
     approvalPendingTooltip: "Cet enregistrement a une demande d'approbation en attente ; cette étape autorise encore la modification",
diff --git a/packages/i18n/src/locales/ja.ts b/packages/i18n/src/locales/ja.ts
index d2d24884f9..132b4f7628 100644
--- a/packages/i18n/src/locales/ja.ts
+++ b/packages/i18n/src/locales/ja.ts
@@ -1219,6 +1219,7 @@ const ja = {
     writeStrippedByState: "次の項目はこのレコードの現在の状態では編集できないため反映されませんでした: {{fields}}",
     writeStrippedPrimaryKey: "次の項目はレコードの識別子で、保存では変更できないため反映されませんでした: {{fields}}",
     writeStrippedComputed: "次の項目はサーバーが数式で計算するため、送信した値は反映されませんでした: {{fields}}",
+    writeStrippedStoredExpression: "次の項目はレコードから計算されるため、送信した値ではなく計算値が保存されました: {{fields}}",
     writeStrippedUnknownReason: "次の項目はサーバーで反映されませんでした: {{fields}}",
     approvalPendingEditable: "承認中 · 編集可能",
     approvalPendingTooltip: "このレコードには承認待ちのリクエストがありますが、このステップでは編集できます",
diff --git a/packages/i18n/src/locales/ko.ts b/packages/i18n/src/locales/ko.ts
index 214671e48e..8507a86c07 100644
--- a/packages/i18n/src/locales/ko.ts
+++ b/packages/i18n/src/locales/ko.ts
@@ -1207,6 +1207,7 @@ const ko = {
     writeStrippedByState: "다음 필드는 이 레코드의 현재 상태에서 편집할 수 없으므로 적용되지 않았습니다: {{fields}}",
     writeStrippedPrimaryKey: "다음 필드는 레코드의 식별자이며 저장으로 변경할 수 없으므로 적용되지 않았습니다: {{fields}}",
     writeStrippedComputed: "다음 필드는 서버가 수식으로 계산하므로 보낸 값이 적용되지 않았습니다: {{fields}}",
+    writeStrippedStoredExpression: "다음 필드는 레코드에서 계산되므로 보낸 값 대신 계산된 값이 저장되었습니다: {{fields}}",
     writeStrippedUnknownReason: "다음 필드는 서버에서 적용되지 않았습니다: {{fields}}",
     approvalPendingEditable: "승인 진행 중 · 편집 가능",
     approvalPendingTooltip: "이 레코드에 대기 중인 승인 요청이 있지만 이 단계에서는 편집할 수 있습니다",
diff --git a/packages/i18n/src/locales/pt.ts b/packages/i18n/src/locales/pt.ts
index 6839879bdb..dbdc574655 100644
--- a/packages/i18n/src/locales/pt.ts
+++ b/packages/i18n/src/locales/pt.ts
@@ -1241,6 +1241,7 @@ const pt = {
     writeStrippedByState: "Não editável no estado atual deste registro, portanto não foi aplicado: {{fields}}",
     writeStrippedPrimaryKey: "O identificador do registro não pode ser alterado ao salvar, portanto não foi aplicado: {{fields}}",
     writeStrippedComputed: "Calculado pelo servidor a partir de uma fórmula, portanto o valor enviado não foi aplicado: {{fields}}",
+    writeStrippedStoredExpression: "Calculado a partir do registro, portanto o valor calculado foi salvo no lugar do enviado: {{fields}}",
     writeStrippedUnknownReason: "Não aplicado pelo servidor: {{fields}}",
     approvalPendingEditable: "Em aprovação · editável",
     approvalPendingTooltip: "Este registro tem uma solicitação de aprovação pendente; esta etapa ainda permite a edição",
diff --git a/packages/i18n/src/locales/ru.ts b/packages/i18n/src/locales/ru.ts
index 354b8aaf30..ae6cc33fad 100644
--- a/packages/i18n/src/locales/ru.ts
+++ b/packages/i18n/src/locales/ru.ts
@@ -1294,6 +1294,7 @@ const ru = {
     writeStrippedByState: "Поля недоступны для редактирования в текущем состоянии записи, поэтому не применены: {{fields}}",
     writeStrippedPrimaryKey: "Идентификатор записи нельзя изменить при сохранении, поэтому поля не применены: {{fields}}",
     writeStrippedComputed: "Поля вычисляются сервером по формуле, поэтому отправленные значения не применены: {{fields}}",
+    writeStrippedStoredExpression: "Поля вычисляются из записи, поэтому вместо отправленных значений сохранены вычисленные: {{fields}}",
     writeStrippedUnknownReason: "Не применены сервером: {{fields}}",
     approvalPendingEditable: "На согласовании · редактирование доступно",
     approvalPendingTooltip: "У этой записи есть ожидающий запрос на согласование, но этот шаг всё ещё разрешает редактирование",
diff --git a/packages/i18n/src/locales/zh.ts b/packages/i18n/src/locales/zh.ts
index c49e1431e5..8aff1bd078 100644
--- a/packages/i18n/src/locales/zh.ts
+++ b/packages/i18n/src/locales/zh.ts
@@ -1100,6 +1100,7 @@ const zh = {
     writeStrippedByState: '以下字段在记录当前状态下不可编辑，未生效：{{fields}}',
     writeStrippedPrimaryKey: '以下字段是记录的标识符，保存时无法修改，未生效：{{fields}}',
     writeStrippedComputed: '以下字段由服务端按公式计算，提交的值未生效：{{fields}}',
+    writeStrippedStoredExpression: '以下字段的值由记录计算得出，已保存计算值而非提交的值：{{fields}}',
     writeStrippedUnknownReason: '以下字段未被服务端写入：{{fields}}',
     approvalPendingEditable: '审批中 · 可编辑',
     approvalPendingTooltip: '该记录有待审批的请求，但当前审批节点仍允许编辑',