update detail.

API/ROLAC.API.Tests/Services/DisbursementServiceTests.cs

@@ -65,6 +65,8 @@ public class DisbursementServiceTests
         var db = BuildDb(userId);
         db.ChurchProfiles.Add(new ChurchProfile { Id = 1, Name = "ROLAC", NextCheckNumber = 1001 });
         db.Members.Add(new Member { Id = 1, FirstName_en = "John", LastName_en = "Doe", Address = "1 Main St", City = "Arcadia", State = "CA", ZipCode = "91006" });
+        db.ExpenseCategoryGroups.Add(new ExpenseCategoryGroup { Id = 1, Name_en = "Equipment" });
+        db.ExpenseCategoryGroups.Add(new ExpenseCategoryGroup { Id = 2, Name_en = "Food & Beverage" });
         db.SaveChanges();
         var fs = new FakeStorage();
         return (SvcAs(db, fs, userId), db, fs);
@@ -73,8 +75,9 @@ public class DisbursementServiceTests
     private static Expense Approved(string type, decimal amount, int? memberId = null, string? vendor = null) => new()
     {
         Type = type, Status = "Approved", Amount = amount, Description = $"{type} {amount}",
-        MinistryId = 1, CategoryGroupId = 1, SubCategoryId = 1, ExpenseDate = new DateOnly(2026, 6, 1),
+        MinistryId = 1, ExpenseDate = new DateOnly(2026, 6, 1),
         MemberId = memberId, VendorName = vendor,
+        Lines = { new ExpenseLine { CategoryGroupId = 1, SubCategoryId = 1, Amount = amount } },
     };
 
     [Fact]
@@ -97,6 +100,28 @@ public class DisbursementServiceTests
         Assert.Equal("1 Main St", member.Address);
     }
 
+    [Fact]
+    public async Task GroupedWorklist_MultiCategoryExpense_ShowsMultipleLabel()
+    {
+        var (svc, db, _) = Build();
+        db.Expenses.Add(new Expense
+        {
+            Type = "VendorPayment", Status = "Approved", Amount = 50m, Description = "mixed invoice",
+            MinistryId = 1, ExpenseDate = new DateOnly(2026, 6, 1), VendorName = "Costco",
+            Lines =
+            {
+                new ExpenseLine { CategoryGroupId = 1, SubCategoryId = 1, Amount = 30m },
+                new ExpenseLine { CategoryGroupId = 2, SubCategoryId = 2, Amount = 20m },
+            },
+        });
+        await db.SaveChangesAsync();
+
+        var groups = await svc.GetApprovedUnpaidGroupedAsync();
+
+        var line = groups.Single(g => g.PayeeType == "Vendor").Lines.Single();
+        Assert.Equal("Multiple / 多類別", line.CategoryName);
+    }
+
     [Fact]
     public async Task Issue_CreatesOneCheckPerPayee_MarksPaid_SequentialNumbers()
     {