Fixed signature error for car-body

src/request-management/request-management.service.ts

@@ -5739,7 +5739,7 @@ export class RequestManagementService {
   }
 
   /**
-   * V2: User signs and accepts/rejects expert decision
+   * V2: User signs and accepts/rejects (expert decision for THIRD_PARTY, or final acknowledgment for CAR_BODY).
    */
   async userSignDecisionV2(
     requestId: string,
@@ -5763,8 +5763,12 @@ export class RequestManagementService {
       );
     }
 
-    // Validate expert decision exists
-    if (!request.expert?.decision) {
+    // THIRD_PARTY: blame expert must have issued a guilt decision before signatures.
+    // CAR_BODY: single-party flow; no blame expert / no expert.decision by design.
+    if (
+      request.type !== BlameRequestType.CAR_BODY &&
+      !request.expert?.decision
+    ) {
       throw new BadRequestException(
         "Expert has not made a decision yet",
       );
@@ -5832,9 +5836,11 @@ export class RequestManagementService {
       );
 
       if (allAccepted) {
-        // Both parties accepted - case is completed
         finalStatus = CaseStatus.COMPLETED;
-        message = "Both parties have accepted. Case completed successfully.";
+        message =
+          updatedRequest.parties.length === 1
+            ? "Case completed successfully."
+            : "Both parties have accepted. Case completed successfully.";
 
         await this.blameRequestDbService.findByIdAndUpdate(requestId, {
           $set: {