The DBA must define the address space where the stored procedure runs.
This can be a DB2 address space or a Work Manager(WLM) address space.
It seems this is already done, since you mention Endevor.
So, the stored procedure in your personal library will not work. You may want to compile your program in Endevor that has the address space already defined. Don't forget, when you compile a stored procedure sometimes you or your DBA must re-cycle the address space in order to pick up the new version of your program.