Is there a way to clear the content stored in dbms_error_code

Hi everybody,
Here is my situation. I'm doing an application in forms 6.i. There's an ON-ERROR trigger defined at form level which calls a procedure programmed to treat errors. Inside this procedure I issue a message like "record is being used by another user" when I get the -54 dbms_error_code.
So far, so good. The problem is when I test the lock. I do a select for update nowait to lock a record (at sql*plus) and then I try to update this record (in forms). The exception is raised just fine. But when I returned to sql*plus and issue a rollback to end the transaction and go to forms and try to continue with the operation, I succeed, the record is recorded in the database but i get the error message "record is being used by another user". This happens always in the commit line of my code and I know that it passes through ON-ERROR and issue the message.
I know that it's because of the last error that ocurred (-54 lock). So i was wondering if there is a way of clearing this last error. Please, anyone can help me?
Thanks anyway.

The On-error trigger gets raised for lots of different reasons. Only a few of these are caused by database errors, and ONLY THEN should you check dbms_error_code.
<p>When you get any other errors, ones caused by doing something wrong within the form processing, On-Error runs, but dbms_error_code is not changed. So you should not check it.
<p>EVERY time on-error runs, you should check Error_Code, and only with certain values should you check DBMS_Error_Text. Here is an on-error trigger I use:
<p>Re: FRM-40735:Pre_Insert trigger raised unhandled exception ORA-20011

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