Using the FM POSTING INTERFACE DOCUMENT

Hello

Im very upset the fact that i dont want to develop a BDC and use instead the function module

POSTING_INTERFACE_DOCUMENT

It is working perfect as long as you only get crédits and débits 40 and 50 posting key

but as soon as special account lets say posting key 29 and the field UMSKZ having a value for special accounts

then everything is not working.

I wrote a BDC and it is working fine because i can tell what i want

like if umskz = 'U'

call screen 303 with date zfbdt

else

call screen 300

I do not know if there is a way to control this

Like a said i run thousands of trans with normal accounts and the FM is perfect and fast

But im resigned to use the BDC

So im thinking that im missing some knowledge of the FM Capabilities

and i need your valuable help

Thanks

Tahar