Interplant Auto Post Posting

HI Expert,

I would like to create the following validation Rule:

BKPF-BLART = XX or YY AND

BSEG-HKONT = XXXXXXXX AND

BSEG-WRBTR = 0 or Null or ' '

Then Error

The condition type for intercompany margin is Blank or 0. but still the document will post with incorrect COGS which need to be recorded.

The requirement is rather than post we would like to see the billing document in Tcode VFX3.but not posted in GL account.

Thanks

Shoeb