RTVCLSRC The RTVCLSRC command is not allowed against an ILE CL module or program object to retrieve the CLLE source.However, the RTVCLSRC is used within a CLLE module orprogram to retrieve the source from an OPM CL program.
I found this at the above URL. Hop it will work this way for you.
You cannot retrieve the source of <i>any</i> ILE module unless the source was stored in listing format in the module when the module was compiled. (You can’t ever retrieve the source of an ILE program because ILE programs never have any source.)
If a listing view was included as a debug option at compile time, the listing can be retrieved. Source can be fairly easily reconstructed from a listing view.