diff --git a/.data/attachments/inbound/rfq-20260727X@x.com.eml b/.data/attachments/inbound/rfq-20260727X@x.com.eml
new file mode 100644
index 0000000..aa5ba44
--- /dev/null
+++ b/.data/attachments/inbound/rfq-20260727X@x.com.eml
@@ -0,0 +1,12 @@
+{
+  "messageId": "rfq-20260727X@x.com",
+  "from": "buyer@x.com",
+  "to": [
+    "rfq@we.com"
+  ],
+  "cc": [],
+  "subject": "【询价】客户 C100 RFQ-20260727X 求报价",
+  "body": "客户编码 C100,询价单号 RFQ-��\nPN-EEE-555 TI 年用量 9000 目标价 6.00 交期 10w",
+  "receivedAt": "2026-07-27T19:00:00.000Z",
+  "attachments": []
+}
\ No newline at end of file
diff --git a/apps/api/src/app/seed-quote.ts b/apps/api/src/app/seed-quote.ts
index c35ef63..d1da641 100644
--- a/apps/api/src/app/seed-quote.ts
+++ b/apps/api/src/app/seed-quote.ts
@@ -217,7 +217,20 @@ export async function seedQuote(container: Container): Promise<void> {
         kind: 'approval',
         label: 'AP 定价审批',
         approver: { position: 'PM', strategy: 'sole' },
-        reject: { kind: 'reopen', nodeId: 'A4', mapping: [] },
+        // 驳回走向的载荷映射不能空:重开的是**新的 A4 实例**,它照样要过 A4 的入参契约。
+        // 空映射 = 重开必失败,等于把「驳回回 A4」写成了一句空话。
+        reject: {
+          kind: 'reopen',
+          nodeId: 'A4',
+          mapping: [
+            { target: 'customerCode', source: { from: 'initiation', path: 'customerCode' } },
+            { target: 'records', source: { from: 'output-port', port: 'intake', path: 'records' } },
+            { target: 'pn', source: { from: 'output-port', port: 'intake', path: 'pn' } },
+            { target: 'materialType', source: { from: 'output-port', port: 'intake', path: 'type_tag' } },
+            { target: 'customerGrade', source: { from: 'constant', value: '普通客户' } },
+            { target: 'volumeTier', source: { from: 'constant', value: '大批量' } },
+          ],
+        },
         nudge: { deadline: 'PT30M', steps: [{ after: 'PT20M', action: 'nudge' }] },
         layout: { row: 0, col: 6 },
       },
diff --git a/apps/api/src/modules/ledger/__tests__/ledger-store.it.test.ts b/apps/api/src/modules/ledger/__tests__/ledger-store.it.test.ts
index ba6a603..0b96640 100644
--- a/apps/api/src/modules/ledger/__tests__/ledger-store.it.test.ts
+++ b/apps/api/src/modules/ledger/__tests__/ledger-store.it.test.ts
@@ -22,6 +22,8 @@ const DOMAIN = 'it_quote';
 const OBJECT = 'intake';
 const T1 = 't-it-1' as TaskId;
 const T2 = 't-it-2' as TaskId;
+const T3 = 't-it-3' as TaskId;
+const T4 = 't-it-4' as TaskId;
 
 const declaration = (fields: ObjectDeclaration['fields']): ObjectDeclaration => ({
   domain: DOMAIN,
@@ -202,4 +204,52 @@ describe('ledger · 真实 PG', () => {
     });
     expect(official.rows[0]).toMatchObject({ grade: 'D' });
   }, 60_000);
+
+  itDb()('基线按字段首次写入捕获:同一行分步写,后写的字段不被误判为他单改动', async () => {
+    // 本例要用到 note 列,先声明物化(只增不破坏)
+    await ledger.applyDeclarations([
+      declaration([
+        { name: 'pn', type: 'text', primaryKey: true, masked: false },
+        { name: 'grade', type: 'text', primaryKey: false, masked: false },
+        { name: 'note', type: 'text', primaryKey: false, masked: false },
+      ]),
+    ]);
+
+    // 先有一版正式记录(模拟前一个实例已放行)
+    await ledger.draftWrite({
+      taskId: T3,
+      address: { domain: DOMAIN, object: OBJECT },
+      key: { pn: 'BASELINE-PN' },
+      patch: { grade: 'A', note: '一版' },
+    });
+    await ledger.releaseWrite(T3);
+
+    // 重开的新实例分**两步**写同一行:先 grade,后 note
+    await ledger.draftWrite({
+      taskId: T4,
+      address: { domain: DOMAIN, object: OBJECT },
+      key: { pn: 'BASELINE-PN' },
+      patch: { grade: 'B' },
+    });
+    await ledger.draftWrite({
+      taskId: T4,
+      address: { domain: DOMAIN, object: OBJECT },
+      key: { pn: 'BASELINE-PN' },
+      patch: { note: '二版' },
+    });
+
+    // 若基线只在建行那一刻捕获,note 就没有基线,会被当成「他单改过」而拒绝放行
+    expect(await ledger.checkConflicts(T4)).toEqual([]);
+    const result = await ledger.releaseWrite(T4);
+    expect(result.mergedRows).toBe(1);
+
+    const official = await ledger.query({
+      address: { domain: DOMAIN, object: OBJECT },
+      where: { pn: 'BASELINE-PN' },
+      orderBy: [],
+      limit: 10,
+      offset: 0,
+    });
+    expect(official.rows[0]).toMatchObject({ grade: 'B', note: '二版' });
+  }, 60_000);
 });
diff --git a/apps/api/src/modules/ledger/internal/adapter/ledger-store.ts b/apps/api/src/modules/ledger/internal/adapter/ledger-store.ts
index 2daac28..3b6182f 100644
--- a/apps/api/src/modules/ledger/internal/adapter/ledger-store.ts
+++ b/apps/api/src/modules/ledger/internal/adapter/ledger-store.ts
@@ -282,6 +282,10 @@ export function createDraftStore(runner: Queryable): DraftStore {
          values ($1,$2,$3,$4,$5,$6,$7,$8)
          on conflict (task_id, domain, object, key_hash) do update
            set patch = ${DRAFT_TABLE}.patch || excluded.patch,
+               -- 基线按**字段**首次写入时捕获:右操作数胜,已有基线保持不变、
+               -- 本次新写的字段补上它们各自的基线。若只在建行时捕获一次,
+               -- 后续步新写的字段就没有基线,冲突检查会把它们一律当成「他单改过」。
+               baseline = excluded.baseline || ${DRAFT_TABLE}.baseline,
                tombstone = excluded.tombstone,
                updated_at = now()`,
         [