sending precise error message

src/modules/user/services/itinerary.service.ts

@@ -2880,18 +2880,28 @@ export class ItineraryService {
           if (!itineraryActivity) {
             throw new ApiError(
               404,
-              `Itinerary activity not found for item ${index}.`,
+              `activities[${index}] with itineraryActivityXid=${item.itineraryActivityXid} was not found.`,
             );
           }
 
-          if (
-            itineraryActivity.itineraryType !== 'ACTIVITY' ||
-            !itineraryActivity.activityXid ||
-            !itineraryActivity.activity
-          ) {
+          if (itineraryActivity.itineraryType !== 'ACTIVITY') {
             throw new ApiError(
               400,
-              'Selections can only be stored for itinerary items linked to an activity.',
+              `activities[${index}] with itineraryActivityXid=${item.itineraryActivityXid} is not an ACTIVITY row. Actual itineraryType=${itineraryActivity.itineraryType}.`,
+            );
+          }
+
+          if (!itineraryActivity.activityXid) {
+            throw new ApiError(
+              400,
+              `activities[${index}] with itineraryActivityXid=${item.itineraryActivityXid} is missing activityXid.`,
+            );
+          }
+
+          if (!itineraryActivity.activity) {
+            throw new ApiError(
+              400,
+              `activities[${index}] with itineraryActivityXid=${item.itineraryActivityXid} could not load linked activity details.`,
             );
           }