SRM PR is created insted of PO ZPROGRAM

HI All,

I have created zprogram:used  BBP_PD_SC_CREATE .

which is successfully creating  SRM SC with items in SRM Dev system  say SC num :"XXXXXX...".

My problem  in backend  ECC dev system  it is creating Purchase  req (PR) for SC num "XXXXXX..." after approval. But I need to create Purchase Order (Po). Can anyone can suggest me what details I need to pass to SC create PO in ECC Dev system.

Thanks

Gopal