OVRDBF WAITRCD(*IMMED) challenges in ILE

Having a problem with getting OVRDBF FILE(SVLOCK) WAITRCD(*IMMED) OVRSCOPE(*JOB) to work. I have a procedure that needs to test if a record is locked (indicating that someone is in an order entry process for the specific order, and nobody else can mess with that order until they let go). The file that this record I test against has forever been defined as WAITRCD(60), and I don't want my test to wait all 60 seconds to find out that I can't mess with that order, so I endeavor to override that.

I suspect it's another of those ILE things I haven't got a firm grasp on, but...

My program LOCKS is a module that I put into our TFSORDERS *srvpgm. LOCKS has logic that calls a private subprocedure that composes the above OVRDBF command, and sends that off in a call to QCMDEXC to affect the override. I have a test program that was created with:
CRTPGM PGM(MKOESTER/TESTSTUFF)
MODULE(MKOESTER/TESTSTUFF)
BNDSRVPGM((MKOESTER/TFSORDERS *IMMED))
ACTGRP(*NEW)

I call TESTSTUFF from a command line. It calls the LOCKS program, and the SEP debugger shows that the LOCKS program does the OPEN SVLOCK (for the USROPN file), and then calls QCMDEXC to do the OVRDBF. With sysAttn > 3 > 15, I can see that the job has the override. The LOCKS program then does a chain to the record that is indeed locked to another job, but won't pass to the next statement until the 60 seconds has passed. I'm feeling ignored here. As the job then proceeds to the end, and sends "DLTOVR FILE(SVLOCK) LVL(*JOB)", also via QCMDEXC, I get the CPF9841 error,
CPF9841 Override not found at specified level.

I've tried replacing the "OVRSCOPE(*JOB)" with "OPNSCOPE(*JOB)" and with "OVRSCOPE(*JOB) OPNSCOPE(*JOB)", with no change to the result -- it still ignores the waitrcd(*immed) and hangs for 60 seconds on the chain.

What am I missing here?

If it helps, code is at http://code.midrange.com/3354d15a07.html and
http://code.midrange.com/60a1ce8920.html

Many thanks,
Michael Koester