Y>Thanks for your advice.
>As a matter of fact I did not use those column names, I took these only as an example.
>
>With your suggested update statement in the trigger I get another error message :
>Connectivity error, ORA-04091 : table MYTABLE is being updated and is not allowed to be approached by a trigger function.
>
>What else can I try to do?
>TIA
>Peter.