LSMW RFBIBL00

Hi

I'm using RFBIBL00 prg for doing FB01 postings.

I use structures BBKPF,BBSEG. Actually in the source file i have 50 line items.

All the 50 line items should get posted as one Document. Now what happens is for each source record..a separate document is created.

Pls help... how to achieve this