Badi trigger at automatic PO creation

Hello Gurus ,

I have a scenario where PO is getting automatically created from the Shopping Cart but the PO is coming different .

I need to change the PO type before the PO get creates in SRM . Can you tell me the BADI which get triggers when during PO creation . BBP_DOC_CHANGE will not help here as it is used for update .

Thanks & Regards

Anshuman