Use SET ROLE in Oracle Forms Builder

Hi,

I am trying to do some authentification in a form and have run into a problem. The user types the usename/password into a couple of fields and presses the login button.

The button trigger PL/SQL looks like this :

DECLARE

	uservar	VARCHAR2(15) := '';
	passvar	VARCHAR2(15) := '';

	uservar := :BLOCK10.USERNAME_BOX;
	passvar := :BLOCK10.PASSWORD_BOX;

	set role uservar identified by passvar;  

/* if OK change context, etc... */

When I try compile I get the message :

Error 103 at line 9, column 6
  Encountered the symbol "ROLE" when expecting one of the following:

  transaction <a SQL statement>

Anyone know what the problem is? All hints greatly appreciated.

Thanks,

Mike.

-- 
_________________________________
There are only 10 types of people in the world -  
  those who understand binary, and those who don't.