Index: vhUnitTest/WSimpl/OBJT/MESService/ValideerOlTag/Test.cls.xml
===================================================================
diff -u -r72987 -r73345
--- vhUnitTest/WSimpl/OBJT/MESService/ValideerOlTag/Test.cls.xml	(.../Test.cls.xml)	(revision 72987)
+++ vhUnitTest/WSimpl/OBJT/MESService/ValideerOlTag/Test.cls.xml	(.../Test.cls.xml)	(revision 73345)
@@ -33,6 +33,7 @@
 	#dim Response As WS.OBJT.MES.dto.ValidateOlTagResponse = MESService.ValideerOlTag(RegisterOlTagRequest)
 	
 	Do $$$AssertEquals(Response.Result,"INVALID")
+	Do $$$AssertEquals(Response.ValidatieError,"OlTag not unique.")
 	
 	Do LadeRegistratieMock.Verifieer()
 ]]></Implementation>
Index: WSimpl/OBJT/MESService.cls.xml
===================================================================
diff -u -r73300 -r73345
--- WSimpl/OBJT/MESService.cls.xml	(.../MESService.cls.xml)	(revision 73300)
+++ WSimpl/OBJT/MESService.cls.xml	(.../MESService.cls.xml)	(revision 73345)
@@ -39,10 +39,11 @@
 			Set Reponse.Result = "VALID"
 		} Else {
 			Set Reponse.Result = "INVALID"
+			Set Reponse.ValidatieError = "OlTag not unique."
 		}
 	} Catch {
 		Set Reponse.Result = "INVALID"
-		Set Reponse.ValidatieError = "Er is een fout opgetreden tijdens het valideren van de OlTag."
+		Set Reponse.ValidatieError = "An unexpected error occured during the validation of the OlTag."
 		
 		#dim Exception As TECH.Exceptions.Exception = ##class(TECH.ExceptionHandler).Catch()
 		Do ##class(vhLib.Logger).%New("MESService - Valideer OL Tag").Error(Reponse.ValidatieError,Exception.ToString())