Limit of 999 line items in BSEG ?

hi,

we have an interface (data from an vendor), which we process with an Z-ABAP. This ABAP creates bcd-data (batch input structure data) and then do a CALL TRANSACTION FB01 to book the document.

Now we have the problem that in some cases the document has more then 999 positions. The FB01 transaction runs into error that more then 999 positions are not allowed.

Is there any SAP standard(!!) that the document is splitted automaticly(!) when call FB01 ? Or does this have to be done manually inside the z-program ?

br Martin