Error when processing my custom segments in FM 'PARSE_IDOC'...

Hello Experts,

I have extended a standard IDoc and when I test it in WE19, it always causes an error

because the application document(PO) is not posted. But it is working fine if I remove

my custom segments in WE19. I think the culprit here is that when I try to add my custom segments

to the parser rules(by way of enhancement spots) and executing it, it does not posts the PO since it

always expect the standard segments of the IDoc.

How do I go about this guys? how do I manipulate the IDoc parser to successfully include

my custom segments?