diff --git a/src/domain/work-orders/mappers/work-order-table-row-mapper.ts b/src/domain/work-orders/mappers/work-order-table-row-mapper.ts
index b17b683a..cea22e59 100644
--- a/src/domain/work-orders/mappers/work-order-table-row-mapper.ts
+++ b/src/domain/work-orders/mappers/work-order-table-row-mapper.ts
@@ -268,15 +268,7 @@ function readHasPendingUplift(
 }
 
 function readPrimaryDispatchStatus(item: Record<string, unknown>): string {
-  return readString(
-    item,
-    "primaryDispatchStatus",
-    "PrimaryDispatchStatus",
-    "dispatchStatus",
-    "DispatchStatus",
-    "vendorDispatchStatus",
-    "VendorDispatchStatus",
-  );
+  return readString(item, "primaryDispatchStatus", "PrimaryDispatchStatus");
 }
 
 export function mapWorkOrderTableRow(raw: unknown): WorkOrderTableRow {
diff --git a/src/domain/work-orders/types/work-order-board-detail.ts b/src/domain/work-orders/types/work-order-board-detail.ts
index 14adb595..163775e9 100644
--- a/src/domain/work-orders/types/work-order-board-detail.ts
+++ b/src/domain/work-orders/types/work-order-board-detail.ts
@@ -42,10 +42,8 @@ export interface WorkOrderBoardDetailInfoApi {
   dayGroup?: string | null;
   vendorId?: number | null;
   vendorName?: string | null;
-  /** Primary dispatch status when the board contract supplies it (SH-183). */
+  /** Exact board DTO field; inactive primary dispatch is not a live company (SH-183). */
   primaryDispatchStatus?: string | null;
-  dispatchStatus?: string | null;
-  vendorDispatchStatus?: string | null;
   techName?: string | null;
   techPhone?: string | null;
   apptDate?: string | null;
diff --git a/src/domain/work-orders/types/work-order-board.ts b/src/domain/work-orders/types/work-order-board.ts
index d8c178c4..bc836d30 100644
--- a/src/domain/work-orders/types/work-order-board.ts
+++ b/src/domain/work-orders/types/work-order-board.ts
@@ -184,10 +184,8 @@ export interface WorkOrderBoardRowApi {
   dayGroup?: string | null;
   vendorId?: number | null;
   vendorName?: string | null;
-  /** Primary dispatch status when the board contract supplies it (SH-183). */
+  /** Exact board DTO field; inactive primary dispatch is not a live company (SH-183). */
   primaryDispatchStatus?: string | null;
-  dispatchStatus?: string | null;
-  vendorDispatchStatus?: string | null;
   techName?: string | null;
   techPhone?: string | null;
   apptDate?: string | null;
diff --git a/src/test/domain/work-orders/mappers/work-order-table-row-mapper.test.ts b/src/test/domain/work-orders/mappers/work-order-table-row-mapper.test.ts
index a2fbd50c..99283be9 100644
--- a/src/test/domain/work-orders/mappers/work-order-table-row-mapper.test.ts
+++ b/src/test/domain/work-orders/mappers/work-order-table-row-mapper.test.ts
@@ -54,11 +54,20 @@ describe("mapWorkOrderTableRow isAddOn", () => {
 describe("mapWorkOrderTableRow primaryDispatchStatus", () => {
   it.each([
     ["primaryDispatchStatus", "Refused"],
-    ["dispatchStatus", "Canceled"],
-    ["vendorDispatchStatus", "Cancelled"],
-  ] as const)("maps %s onto primaryDispatchStatus", (key, value) => {
+    ["PrimaryDispatchStatus", "Canceled"],
+  ] as const)("maps exact DTO field %s onto primaryDispatchStatus", (key, value) => {
     const row = mapWorkOrderTableRow({ id: 9, vendorId: 45, [key]: value });
     expect(row.vendorId).toBe("45");
     expect(row.primaryDispatchStatus).toBe(value);
   });
+
+  it("ignores undocumented dispatchStatus aliases", () => {
+    const row = mapWorkOrderTableRow({
+      id: 9,
+      vendorId: 45,
+      dispatchStatus: "Refused",
+      vendorDispatchStatus: "Cancelled",
+    });
+    expect(row.primaryDispatchStatus).toBe("");
+  });
 });
diff --git a/src/test/domain/work-orders/utils/wo-closability.test.ts b/src/test/domain/work-orders/utils/wo-closability.test.ts
index d7eaf16b..c463dd5f 100644
--- a/src/test/domain/work-orders/utils/wo-closability.test.ts
+++ b/src/test/domain/work-orders/utils/wo-closability.test.ts
@@ -428,6 +428,12 @@ describe("tableRowToClosabilityInput", () => {
       expect(getClosabilityGaps(input)).toContain("Company");
     },
   );
+
+  it("raises Company when the board omits vendor assignment (inactive primary, SH-183)", () => {
+    const input = tableRowToClosabilityInput({ ...closableRow, vendorId: "", company: "" });
+    expect(input.vendorId).toBe("");
+    expect(getClosabilityGaps(input)).toContain("Company");
+  });
 });
 
 describe("readDetailWoType", () => {