call levels, activation groups and active overrides

Hey all,

I've got a question

I've written an app, that kind of mixes OPM style calls with ILE style
calls, and i ran into something that I don't quite understand.

given the following schenario: (all programs are RPGIV - all override
commands are done using callPs to QCMDEXC, in the rpg programs)

call programA  - dftactgrp(*NO) actgrp(*YES)
  ovrdbf file1 tofile(lib1/file1)
  open file1
  close file1
  dltovr file1
  call programb  - dftactgrp(*NO) actgrp(*CALLER)
    ovrdbf file1 tofile(lib1/file1)
    open file1
    close file1
    dltovr file1
    seton lr
    return
  call programc  - - dftactgrp(*NO) actgrp(*CALLER)
    ovrdbf file1 tofile(lib1/file1)
    open file1
    close file1
    seton lr
    return
  cpyf lib1/file1 lib2/file1 mbropt(*add)

notice, programC doesn't delete the override.
I stepped through this in debug, and when I got to the cpyf statement at
the end, it bombed with 'from and to file/member cannot be the same'.

this would indicate that the override is still in effect from when programc
was called, which i guess is caused by it being in the same activation
group (*caller).  Right?  so, even though I seton LR and ended that call
level, the override remained in effect.

but why is it, if just before the cpyf command, I do a shift/sysrequest/3
and display active overrides, none are listed?

Thanks,

Rick