diff --git a/src/lib/server/orders-service-review.test.ts b/src/lib/server/orders-service-review.test.ts
index b850347..d0f451f 100644
--- a/src/lib/server/orders-service-review.test.ts
+++ b/src/lib/server/orders-service-review.test.ts
@@ -143,6 +143,55 @@ describe("updateOrderReviewFields", () => {
     expect(result.customer).toBe("cust-new");
   });
 
+  it("updates company when cascaded from a customer change", async () => {
+    const order = await pbMock.collection("orders").create({
+      order_number: "ORD-2026-07-001",
+      customer: "cust-old",
+      company: "co-old",
+    });
+
+    const result = await updateOrderReviewFields(order.id, {
+      company: "co-new",
+    });
+
+    expect(result.company).toBe("co-new");
+  });
+
+  it("updates rep when cascaded from a customer change", async () => {
+    const order = await pbMock.collection("orders").create({
+      order_number: "ORD-2026-07-001",
+      customer: "cust-old",
+      rep: "Old Rep",
+    });
+
+    const result = await updateOrderReviewFields(order.id, {
+      rep: "Jane Smith",
+    });
+
+    expect(result.rep).toBe("Jane Smith");
+  });
+
+  it("updates company and rep together with customer and order_number", async () => {
+    const order = await pbMock.collection("orders").create({
+      order_number: "ORD-2026-07-001",
+      customer: "cust-old",
+      company: "co-old",
+      rep: "Old Rep",
+    });
+
+    const result = await updateOrderReviewFields(order.id, {
+      order_number: "ORD-2026-07-014",
+      customer: "cust-new",
+      company: "co-new",
+      rep: "Jane Smith",
+    });
+
+    expect(result.order_number).toBe("ORD-2026-07-014");
+    expect(result.customer).toBe("cust-new");
+    expect(result.company).toBe("co-new");
+    expect(result.rep).toBe("Jane Smith");
+  });
+
   it("throws OrderNumberCollisionError when another order owns the number", async () => {
     await pbMock.collection("orders").create({
       order_number: "ORD-2026-07-001",
diff --git a/src/lib/server/orders-service.ts b/src/lib/server/orders-service.ts
index 373263c..8705232 100644
--- a/src/lib/server/orders-service.ts
+++ b/src/lib/server/orders-service.ts
@@ -287,14 +287,21 @@ export class OrderNumberCollisionError extends Error {
 
 /**
  * Patches the order header fields editable from the review modal.
- * Currently supports `order_number` and `customer`. Validates
- * `order_number` uniqueness against the `orders` collection
- * (excluding self) before write; throws
+ * Supports `order_number`, `customer`, `company` (relation id), and
+ * `rep` (free-text snapshot of the rep's name). The `company` and
+ * `rep` fields are cascaded from the selected customer by the modal
+ * (see `orders-review-modal.tsx`). Validates `order_number` uniqueness
+ * against the `orders` collection (excluding self) before write; throws
  * `OrderNumberCollisionError` on collision.
  */
 export async function updateOrderReviewFields(
   orderId: string,
-  patch: { order_number?: string; customer?: string },
+  patch: {
+    order_number?: string;
+    customer?: string;
+    company?: string;
+    rep?: string;
+  },
 ) {
   const pb = await getAdminPocketBase();
 
@@ -331,6 +338,8 @@ export async function updateOrderReviewFields(
   const cleanPatch: Record<string, unknown> = {};
   if (patch.order_number !== undefined) cleanPatch.order_number = patch.order_number;
   if (patch.customer !== undefined) cleanPatch.customer = patch.customer;
+  if (patch.company !== undefined) cleanPatch.company = patch.company;
+  if (patch.rep !== undefined) cleanPatch.rep = patch.rep;
 
   if (Object.keys(cleanPatch).length === 0) {
     // No-op — just re-fetch and return.