Frequent-Error-Messages.md

-# ERROR: duplicate key violates unique constraint 'sampling_sites_identifier_sampling_site_key'
+# "ERROR: duplicate key violates unique constraint 'sampling_sites_identifier_sampling_site_key'"
 
 ## Cause
 You try to insert data in a table (here _sampling_sites_) and the identifier (here column _identifier_sampling_site_) of one or many rows already exists in the database. 
@@ -10,3 +10,13 @@ Check the already existing data in the database for that table. If your data wer
 
 If you by chance build the same identifier for different data, consider to make your identifier more specific, e.g. by adding the country abbreviation as a prefix.
 
+# "ERROR: permission denied for view licenses" when deleting data
+
+Together with "Error synchronizing with the database".
+
+## Cause
+You tried to delete data in a view where you do not have the permission to do so.
+
+## Solution
+To edit or delete data, please always use the views with suffix __import_ or __qa_rejected_.
+