File Locking Problems?

I'm attempting to call a program from a trigger, but
I'm getting an error indicating that the application
is unable to open the file.  I've notice that it locks
the files eventhough I' added the CHAIN(N).  I don't
quite understand why it would lock all of the files. 
Is there a way to avoid this?  Is there a CL command
that "UNLOCKS" all of the file that are being used. 
For example, I call a CL that calls the RPG, then
returns to the CL who in turn "UNLOCKS" all of the
files used...  or is there a better way?  Any help
would greatly be appreciated.




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