fix

Projects/永冠OPP/WCS.Service/Extensions/TaskExtension.cs

@@ -40,7 +40,8 @@ namespace WCS.Service.Extensions
                 return tasklist.OrderBy(v => v.Col).ToArray();
             }
             return tasklist.OrderByDescending(v => v.Priority)
-                           .GroupBy(v => v.MaterialCode).FirstOrDefault()
+                           .GroupBy(v => v.MaterialCode)
+                           .OrderBy(v => v.Key).FirstOrDefault()
                            .OrderByDescending(v => v.Priority)
                            .ThenBy(v => v.Line)
                            .ThenBy(v => v.Layer)