BAPI_PO_CREATE1

Dear Sapians,

We are using BAPI_PO_CREATR1 to create PO by refering a Service Contract. In the input parameter we are passing item category as 'B' But the system takes 'D' (i.e from contract).

Pl suggest me to have a PO created with Item category 'B' By referencing the service contract.

Thanks in Advance