@@ -0,0 +1,15 @@
+---
+'@objectstack/service-analytics': patch
+---
+
+fix(service-analytics): a dataset measure column takes the source field's currency only when that field's `currencyConfig.currencyMode` is `'fixed'`. Otherwise it takes the tenant default (#20091)
+
+Clause-②: no
+
+`AnalyticsServicePlugin` passes each source field's metadata to the service through `sourceFieldMeta`. That hook passed on `currencyConfig.defaultCurrency` whatever `currencyMode` said, and `queryDataset` put it on the result column as `currency`. The column is resolved in this order: the measure's own `currency`, then that value, then `ExecutionContext.currency`. So a `dynamic` field's `defaultCurrency` showed on analytics, chart and dataset faces, where the tenant currency belonged. That covers a `currencyConfig` naming no mode too, which is `dynamic` by the schema default. Parsed through the spec, a `currencyConfig: {}` also carries the schema's placeholder `CNY`, and that reached the column as if an author had written it.
+
+- **What changes**: the relay now passes `defaultCurrency` on only under `currencyMode: 'fixed'`. This is the rule `CurrencyConfigSchema` declares, and objectui's field faces already follow it: only `fixed` gives a field one currency, and a field without one uses the tenant default at runtime. On both the live and the draft-preview path of `queryDataset`, the column now carries:
+  - the field's currency for a `fixed` field;
+  - `ExecutionContext.currency` for a `dynamic` field, a config naming no mode, an empty config, or no config at all.
+- **What does not change**: a measure's explicit `currency` still wins, over a fixed field as well. A non-monetary measure still gets no code. `AnalyticsService.query` (the cube face) still carries no column currency. The `AnalyticsServiceConfig.sourceFieldMeta` type is unchanged.
+- **Hosts that write their own `sourceFieldMeta`**: its `defaultCurrency` means the field's fixed currency. Return `currencyConfig.defaultCurrency` only when `currencyConfig.currencyMode === 'fixed'`, and return `undefined` otherwise. The TSDoc on `AnalyticsServiceConfig.sourceFieldMeta` states the rule.
@@ -0,0 +1,262 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * [#20091] A dataset measure's result-column `currency` honours the source
+ * field's `currencyConfig.currencyMode`.
+ *
+ * ## The contract (spec, not this service)
+ *
+ * `CurrencyConfigSchema` (`packages/spec/src/data/field.zod.ts`) declares
+ * `currencyMode: 'dynamic' | 'fixed'`, defaulting to `'dynamic'`, and
+ * `defaultCurrency` defaulting to `'CNY'`. Its own precision refinement reads
+ * `defaultCurrency` as the field's one currency ONLY under `'fixed'` — "dynamic
+ * mode is out of reach BY DESIGN" — and the `FieldSchema` guidance for the
+ * mistaken `currency` key says a fixed currency is declared as
+ * `currencyConfig: { currencyMode: 'fixed', defaultCurrency: … }` and "A field
+ * without one uses the tenant default at runtime".
+ *
+ * So a `dynamic` field has no field-level currency. Its `defaultCurrency` is
+ * not the column's currency; the tenant default (`ExecutionContext.currency`)
+ * is. objectstack-ai/objectui#10461 made the renderer's `resolveFieldCurrency`
+ * read `defaultCurrency` only under `'fixed'`; the renderer reads an explicit
+ * column `currency` FIRST, so an analytics column that still carried a dynamic
+ * field's `defaultCurrency` overrode the renderer's rule on exactly the faces
+ * this service feeds.
+ *
+ * ## Why this suite boots the PLUGIN over a REAL engine
+ *
+ * The defect lived in the RELAY — `AnalyticsServicePlugin`'s `sourceFieldMeta`,
+ * which reads the registered object off the `'data'` engine — not in the
+ * service's chain. Every pre-existing currency case in this package stubs
+ * `sourceFieldMeta` directly, so none of them could see what the relay does
+ * with `currencyMode`. Here the object is registered on a real `ObjectQL`
+ * engine over `SqliteWasmDriver`, the plugin reads it the way production does,
+ * and the currency is read off the `queryDataset` RESULT.
+ *
+ * ## Two arrival shapes of "a config naming no mode"
+ *
+ * The registry does not parse (`SchemaRegistry.registerObject` stores what it
+ * is handed), so the relay sees whichever shape the door delivered:
+ *
+ *   - RAW — a programmatic `registerObject`: `{ defaultCurrency: 'EUR' }` has
+ *     NO `currencyMode` key at all, and `{}` has no `defaultCurrency` either.
+ *   - PARSED — the declared-stack path (`ObjectSchema.parse`): the schema's
+ *     defaults are materialised, so no-mode reads `currencyMode: 'dynamic'` and
+ *     `{}` reads `{ currencyMode: 'dynamic', defaultCurrency: 'CNY' }` — the
+ *     spec's placeholder `CNY` then leaked onto the column as if authored.
+ *
+ * Both must answer the same: no mode is `dynamic` by the schema default.
+ *
+ * ## Both `queryDataset` paths
+ *
+ * The one reader of the relay's currency is `enrichResultColumns`, which the
+ * live path and the ADR-0037 P3 draft-preview path both run. Each case below
+ * is asserted on both. `AnalyticsService.query` (the cube face) carries no
+ * column `currency` at all — the last block pins that, so "the cube face is
+ * unaffected" is a measurement rather than an assumption.
+ */
+
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import { SqliteWasmDriver } from '@objectstack/driver-sqlite-wasm';
+import { ObjectQL } from '@objectstack/objectql';
+import { ObjectSchema } from '@objectstack/spec/data';
+import { DatasetSchema } from '@objectstack/spec/ui';
+import type { ExecutionContext } from '@objectstack/spec/kernel';
+import type { AnalyticsResult } from '@objectstack/spec/contracts';
+
+import type { AnalyticsService } from '../analytics-service.js';
+import { AnalyticsServicePlugin } from '../plugin.js';
+
+const quiet = { debug() {}, info() {}, warn() {}, error() {}, trace() {}, fatal() {}, child() { return quiet; } };
+
+const OBJECT = 'money_deal';
+
+/** The fields as AUTHORED — one per case, plus a non-monetary control. */
+const AUTHORED_FIELDS = {
+  stage: { type: 'text' },
+  amt_fixed: { type: 'currency', currencyConfig: { currencyMode: 'fixed', defaultCurrency: 'EUR' } },
+  amt_dynamic: { type: 'currency', currencyConfig: { currencyMode: 'dynamic', defaultCurrency: 'EUR' } },
+  amt_nomode: { type: 'currency', currencyConfig: { defaultCurrency: 'EUR' } },
+  amt_emptycfg: { type: 'currency', currencyConfig: {} },
+  amt_bare: { type: 'currency' },
+  units: { type: 'number' },
+} as const;
+
+const ROWS = [
+  { id: 'd1', stage: 'won', amt_fixed: 10, amt_dynamic: 10, amt_nomode: 10, amt_emptycfg: 10, amt_bare: 10, units: 1 },
+  { id: 'd2', stage: 'lost', amt_fixed: 5, amt_dynamic: 5, amt_nomode: 5, amt_emptycfg: 5, amt_bare: 5, units: 2 },
+];
+
+const DATASET = DatasetSchema.parse({
+  name: 'money_by_stage',
+  label: 'Money by Stage',
+  object: OBJECT,
+  dimensions: [{ name: 'stage', field: 'stage', type: 'string' }],
+  measures: [
+    { name: 'm_fixed', aggregate: 'sum', field: 'amt_fixed' },
+    { name: 'm_dynamic', aggregate: 'sum', field: 'amt_dynamic' },
+    { name: 'm_nomode', aggregate: 'sum', field: 'amt_nomode' },
+    { name: 'm_emptycfg', aggregate: 'sum', field: 'amt_emptycfg' },
+    { name: 'm_bare', aggregate: 'sum', field: 'amt_bare' },
+    // An explicit measure `currency` wins over every field-side answer,
+    // the field's FIXED currency included.
+    { name: 'm_explicit_dynamic', aggregate: 'sum', field: 'amt_dynamic', currency: 'JPY' },
+    { name: 'm_explicit_fixed', aggregate: 'sum', field: 'amt_fixed', currency: 'JPY' },
+    { name: 'm_units', aggregate: 'sum', field: 'units' },
+  ],
+});
+
+const SELECTION = {
+  dimensions: ['stage'],
+  measures: DATASET.measures!.map((m) => m.name),
+};
+
+/** A tenant whose default currency differs from every field's `defaultCurrency`. */
+const CTX = { currency: 'USD' } as ExecutionContext;
+
+type Shape = 'raw' | 'parsed';
+
+function fieldsFor(shape: Shape): Record<string, unknown> {
+  if (shape === 'raw') return AUTHORED_FIELDS as unknown as Record<string, unknown>;
+  // The declared-stack door: the spec's own parse materialises the defaults.
+  return ObjectSchema.parse({ name: OBJECT, label: 'Money Deal', fields: AUTHORED_FIELDS }).fields as Record<string, unknown>;
+}
+
+/**
+ * A `'protocol'` service answering one PENDING seed draft for {@link OBJECT},
+ * which is what routes `queryDataset({ previewDrafts: true })` onto the
+ * draft-preview path through the plugin's own `draftRowsResolver`.
+ */
+const pendingSeedProtocol = {
+  getMetaItems: async () => [{ name: 'money_seed', object: OBJECT }],
+  getMetaItem: async () => ({ item: { records: ROWS } }),
+};
+
+async function bootPlugin(engine: ObjectQL): Promise<AnalyticsService> {
+  const registered: Record<string, unknown> = {};
+  const services: Record<string, unknown> = { data: engine, protocol: pendingSeedProtocol };
+  const ctx = {
+    getService: (name: string) => services[name] ?? registered[name],
+    registerService: (name: string, svc: unknown) => { registered[name] = svc; },
+    replaceService: (name: string, svc: unknown) => { registered[name] = svc; },
+    logger: quiet,
+  };
+  await new AnalyticsServicePlugin({
+    // The engine path, so the live rows really come from the driver.
+    queryCapabilities: () => ({ nativeSql: false, objectqlAggregate: true, inMemory: false }),
+  }).init(ctx as never);
+  return registered.analytics as AnalyticsService;
+}
+
+const currencyByColumn = (result: AnalyticsResult): Record<string, string | undefined> =>
+  Object.fromEntries(
+    (result.fields ?? [])
+      .filter((f) => f.name.startsWith('m_'))
+      .map((f) => [f.name, (f as { currency?: string }).currency]),
+  );
+
+describe.each<Shape>(['raw', 'parsed'])('[#20091] result-column currency honours currencyMode — %s registration', (shape) => {
+  let driver: SqliteWasmDriver;
+  let service: AnalyticsService;
+  let live: Record<string, string | undefined>;
+  let preview: Record<string, string | undefined>;
+  let liveRows: AnalyticsResult['rows'];
+
+  beforeAll(async () => {
+    const fields = fieldsFor(shape);
+    driver = new SqliteWasmDriver({ filename: ':memory:' });
+    (driver as unknown as { logger: unknown }).logger = quiet;
+    await driver.initObjects([{ name: OBJECT, fields } as never]);
+    for (const row of ROWS) await driver.create(OBJECT, { ...row });
+    const engine = new ObjectQL({ logger: quiet } as never);
+    engine.registerDriver(driver as never, true);
+    await engine.init();
+    engine.registerObject({ name: OBJECT, label: 'Money Deal', fields } as never);
+    service = await bootPlugin(engine);
+
+    const liveResult = await service.queryDataset(DATASET, SELECTION, CTX);
+    const previewResult = await service.queryDataset(DATASET, SELECTION, CTX, { previewDrafts: true });
+    live = currencyByColumn(liveResult);
+    preview = currencyByColumn(previewResult);
+    liveRows = liveResult.rows;
+  });
+  afterAll(async () => {
+    await driver?.disconnect?.();
+  });
+
+  it('CONTROL: the registered object is what this shape says it is', () => {
+    // Without this the two describe blocks could be measuring one shape twice.
+    const nomode = (fieldsFor(shape).amt_nomode as { currencyConfig?: { currencyMode?: string } }).currencyConfig;
+    expect(nomode?.currencyMode).toBe(shape === 'raw' ? undefined : 'dynamic');
+  });
+
+  it('CONTROL: the live path really ran over the driver rows', () => {
+    const won = (liveRows as Array<Record<string, unknown>>).find((r) => r.stage === 'won');
+    expect(won?.m_fixed).toBe(10);
+  });
+
+  it("currencyMode 'fixed' — the column carries the field's currency", () => {
+    expect(live.m_fixed).toBe('EUR');
+    expect(preview.m_fixed).toBe('EUR');
+  });
+
+  it("currencyMode 'dynamic' — the column carries the tenant default, never the field's defaultCurrency", () => {
+    expect(live.m_dynamic).toBe('USD');
+    expect(preview.m_dynamic).toBe('USD');
+  });
+
+  it('a currencyConfig naming no mode is dynamic — the tenant default', () => {
+    expect(live.m_nomode).toBe('USD');
+    expect(preview.m_nomode).toBe('USD');
+  });
+
+  it("an empty currencyConfig is dynamic — the spec's defaulted CNY never reaches the column", () => {
+    expect(live.m_emptycfg).toBe('USD');
+    expect(preview.m_emptycfg).toBe('USD');
+  });
+
+  it('a currency field with no currencyConfig — the tenant default', () => {
+    expect(live.m_bare).toBe('USD');
+    expect(preview.m_bare).toBe('USD');
+  });
+
+  it('an explicit measure currency wins, over a dynamic field and over a fixed one', () => {
+    expect(live.m_explicit_dynamic).toBe('JPY');
+    expect(preview.m_explicit_dynamic).toBe('JPY');
+    expect(live.m_explicit_fixed).toBe('JPY');
+    expect(preview.m_explicit_fixed).toBe('JPY');
+  });
+
+  it('CONTROL: a non-monetary measure carries no currency', () => {
+    expect(live.m_units).toBeUndefined();
+    expect(preview.m_units).toBeUndefined();
+  });
+});
+
+describe('[#20091] the cube face carries no column currency to disagree about', () => {
+  it('AnalyticsService.query over the same registered object mints no `currency` on any column', async () => {
+    const driver = new SqliteWasmDriver({ filename: ':memory:' });
+    (driver as unknown as { logger: unknown }).logger = quiet;
+    await driver.initObjects([{ name: OBJECT, fields: AUTHORED_FIELDS } as never]);
+    for (const row of ROWS) await driver.create(OBJECT, { ...row });
+    const engine = new ObjectQL({ logger: quiet } as never);
+    engine.registerDriver(driver as never, true);
+    await engine.init();
+    engine.registerObject({ name: OBJECT, label: 'Money Deal', fields: AUTHORED_FIELDS } as never);
+    const service = await bootPlugin(engine);
+    // Registering the dataset compiles its cube under the dataset's name.
+    service.registerDataset(DATASET);
+    try {
+      const result = await service.query(
+        { cube: DATASET.name, dimensions: ['stage'], measures: ['m_fixed', 'm_dynamic'] } as never,
+        CTX,
+      );
+      // Positive control: the query answered, so "no currency" is about the
+      // columns and not about an empty response.
+      expect(result.fields?.map((f) => f.name)).toEqual(expect.arrayContaining(['m_fixed', 'm_dynamic']));
+      for (const f of result.fields ?? []) expect((f as { currency?: string }).currency).toBeUndefined();
+    } finally {
+      await driver.disconnect?.();
+    }
+  });
+});
@@ -683,9 +683,15 @@ export interface AnalyticsServiceConfig {
    * live on the field reach the result columns. `undefined` for an unknown
    * field. Feeds three chains:
    *
-   * - ADR-0053 currency: a monetary measure that omits an explicit `currency`
-   *   falls back to the field's declared currency, then the tenant default
+   * - Currency: a monetary measure that omits an explicit `currency` falls
+   *   back to the field's FIXED currency, then the tenant default
    *   (`ctx.currency`). Non-`currency` fields never get a code.
+   *   [#20091] `defaultCurrency` here means the field's fixed currency: answer
+   *   `currencyConfig.defaultCurrency` ONLY when `currencyConfig.currencyMode`
+   *   is `'fixed'`, and `undefined` otherwise. A `dynamic` field — and a config
+   *   naming no mode, `dynamic` by the spec's default — has no field-level
+   *   currency; the tenant default applies. `AnalyticsServicePlugin`'s relay
+   *   is the reference answer.
    * - Percent scale (objectui#3136): a measure over a `percent` field inherits
    *   that field's storage scale via `percentScaleOf`, so a renderer scales by
    *   declared metadata instead of guessing from the value.
@@ -1789,10 +1795,11 @@ export class AnalyticsService implements IAnalyticsService {
         // and break the moment the default is spelled in another language.
         if (f.builtinAggregate == null && m.label == null && m.aggregate) f.builtinAggregate = m.aggregate;
         if (f.format == null && m.format) f.format = m.format;
-        // ADR-0053 currency chain. A MONETARY measure resolves its display
-        // currency from: explicit measure `currency` → source-field
-        // `currencyConfig.defaultCurrency` → tenant default (`ctx.currency`). A
-        // measure is monetary if it declares a currency OR aggregates a
+        // Currency chain. A MONETARY measure resolves its display currency
+        // from: explicit measure `currency` → the source field's FIXED
+        // currency (`sourceFieldMeta().defaultCurrency`, relayed only under
+        // `currencyMode: 'fixed'` — #20091) → tenant default (`ctx.currency`).
+        // A measure is monetary if it declares a currency OR aggregates a
         // `currency`-type field; non-monetary measures (count, avg of a plain
         // number) never receive a currency code.
         const fc = f as { currency?: string };
 
@@ -1067,8 +1067,25 @@ export class AnalyticsServicePlugin implements Plugin {
       // of the two moves.
       debugSql: this.options.debugSql,
       // Source-field metadata behind the display chains on result columns:
-      // ADR-0053 currency (`currencyConfig.defaultCurrency`) and percent scale
-      // (`max`, which is what marks whole-percent storage — objectui#3136).
+      // the field's FIXED currency and percent scale (`max`, which is what
+      // marks whole-percent storage — objectui#3136).
+      //
+      // [#20091] `defaultCurrency` is relayed ONLY under
+      // `currencyConfig.currencyMode === 'fixed'`. That is the spec's own
+      // reading of the pair (`CurrencyConfigSchema`, `packages/spec/src/data/
+      // field.zod.ts`): only `fixed` pins one currency to the field, and a
+      // field without one "uses the tenant default at runtime". `dynamic` —
+      // and a config naming no mode, which IS `dynamic` by the schema default —
+      // has no field currency, so its `defaultCurrency` (possibly the schema's
+      // placeholder `CNY`, materialised by a parse the author never saw) is
+      // not relayed and the result column falls through to `ctx.currency`.
+      // Decided HERE, at the one producer, so every reader of
+      // `sourceFieldMeta().defaultCurrency` inherits one rule — the same one
+      // objectui's `resolveFieldCurrency` applies on the field faces
+      // (objectstack-ai/objectui#10461). Mode is compared rather than
+      // defaulted: the registry stores what it was handed, so a raw
+      // registration arrives with no `currencyMode` key at all, and a parsed
+      // one with `'dynamic'` — both are "not fixed".
       //
       // [#17560] A formula field's declared `returnType` was relayed here too
       // (#16236) for one reader — `measureResultType`'s `formula` branch. That
@@ -1078,11 +1095,13 @@ export class AnalyticsServicePlugin implements Plugin {
       // on regardless would relay metadata into a seam nothing reads.
       sourceFieldMeta: (object: string, field: string) => {
         const f = dataEngine()?.getObject?.(object)?.fields?.[field] as
-          | { type?: string; max?: number; currencyConfig?: { defaultCurrency?: string } }
+          | { type?: string; max?: number; currencyConfig?: { currencyMode?: string; defaultCurrency?: string } }
           | undefined;
-        return f
-          ? { type: f.type, max: f.max, defaultCurrency: f.currencyConfig?.defaultCurrency }
+        if (!f) return undefined;
+        const fixedCurrency = f.currencyConfig?.currencyMode === 'fixed'
+          ? f.currencyConfig.defaultCurrency
           : undefined;
+        return { type: f.type, max: f.max, defaultCurrency: fixedCurrency };
       },
       // #5033 — the datasource an object is bound to, used ONLY to name the
       // actual cause when a dataset's SQL references a table that is not on the