diff --git a/annotation-web/src/main/resources/messages_en.properties b/annotation-web/src/main/resources/messages_en.properties
index 46503f35..61427a48 100644
--- a/annotation-web/src/main/resources/messages_en.properties
+++ b/annotation-web/src/main/resources/messages_en.properties
@@ -18,7 +18,10 @@ error.annotation_not_found=No annotation found with the given identifier! {0}
 error.annotation_apikey_file_not_found=No apiKey file found in {0} folder!
 #error.annotation_operation_not_authorized=The user is not allowed to perform the given operation!
 error.annotation_client_not_authorized=The client application is not allowed to perform the given operation!
-error.annotation_client_not_public=The client is not authorized to perform the given operation because the public id for the client is missing. Please get in contact with the Europeana APIs customer support via api@europeana.eu
+
+error.annotation_client_not_public=The client is not authorised to perform the given operation because the public id for the client is missing. Please get in contact with the Europeana APIs customer support via api@europeana.eu
+error.annotation_client_not_public.label=Client not authorised due to missing public id
+error.annotation_client_not_public.code=403_client_not_public
 
 error.annotation_invalid_token=The provided authentication token is invalid! {0}
 error.annotation_user_not_authorized=The user is not authorized to perform the given action! {0}