Set Encryption password and SQL20143N

Hi all,

I'm on DB2 9.5 fp 0 on Windows.
I have a simple SQL stored procedure which uses the Encrypt() function
to insert data in a table.
I do not set the encryption password inside the procedure, I plan to
issue an Set Encryption statement at the beginning of every database
session from our middle layer.

But for now I use clp or db2ce to run something like

Set encryption password = 'password';
call sp();

When trying to run it, I get
SQL20143N The encryption or decryption function failed, because the
ENCRYPTION PASSWORD value is not set. SQLSTATE=51039

Is embedding the 'Set encryption password' statement in all my sql
stored procedures the only option I have here?

thanks!