IBM Precompiler API help

Hi all,

Has anyone had any experience using any of the compiler API's, such as
QbnStartPreProcessor, QbnAddBindtimeExit and QbnEndPreProcessor?
 
I'm trying to 'pause' the compilation process (for a bound program using
the CRTBND* commands) between module creation and the binding phase.
According to the documentation
(http://publib.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/QB3AMV00/CCONTENTS
is the V4R5 version, but the API's don't seem to have changed) I need to
call the QbnStartPreProcessor API at the begining of my precompiler,
then call the QbnAddBindtimeExit API to define a preprocessor program to
be called after module creation but before binding, and finally call the
QbnEndPreProcessor API at the end of my preprocessor.
 
The calls to QbnStartPreProcessor and QbnAddBindtimeExit work fine (at
least no errors are returned in the QUSEC structure), but
QbnEndPreProcessor always throws a CPF5D23 ("Source file member has been
changed.") error. Now frankly maybe I'm in over my head here (no-one
responded to my request for information on the iSeries forum, so perhaps
no-one has used these API's?) but since I don't actually change the
contents of the source member being used for the compilation in any way,
so I don't understand the error message.
 
Thanks for any help,
 
Rory
 
p.s. David, I know this isn't specifically an RPG question, but since my
precompiler is written in RPG, I thought this would be the best place to
ask.