SRM PO currency diff than R/3 PO. Extended Scenario

Hi Experts,

Can any please share how can control values passed from Shopping Cart to SRM PO in extended scenario.

Requirement is to have SRMPO with SC currency and not default vendor currency

I know by using BBP_ECS_PO_OUT_BADI we can handle SRM PO -> R/3 PO. I want to manipulate SRMPO before it gets created.

Any help/hint is highly appreciated.