diff --git a/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs b/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs
index 598aaf88..8657e0ae 100644
--- a/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs
+++ b/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs
@@ -293,7 +293,7 @@ namespace ZUGFeRDRESTService.Controllers
                     {
                         case ErrorCodes.MissingValueException:
                             oErrors.AddRange(from item in oPropertyResult.MissingProperties
-                                             select (item.EN16931_ID + "(" + item.Description + ")"));
+                                             select (item.EN16931_ID + " (" + item.Description + ")"));
                             break;
                         default:
                             break;