SRM PR is created insted of PO ZPROGRAM

HI All,

I have created SRM Shopping cart by zprogram used : BBP_PD_SC_CREATE'.

which is successfully creating  SC with items in SRM Dev  system .

My problem  in backend  ECC dev system  it is creating Purchase  req (PR) 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