ERROR IN EXCISE INVOICE GENERATION

HI

FRIENDS

when i am creating excise invoice ref to proforma invoice an error is coming--CUSTOMIZATION FOR DOCUMENT TYPE F8 MISSING IN TABLE BILLING TYPE REFERENCE.

How to resolve the error , here i am doing intra company stock transfer process . i.e plant belongs to same company code one is cutomer & othe vend

plz help

regards

ambarish