Convert A Purchase Requisition (AG) to Planned Order (AI)

Dears,

I have a purchase requisition with a source of supply (external vendor loc type 1011) in APO and also in ECC.

I want to convert this Purchase Requisition to Planned Order in APO and in the process clear the Purchase Requisitions in ECC and send planned orders to ECC. User will decide to convert this to Purchase Requisitions if and when he/she feels the need for it.

How do I accomplish this

What are the Pre-requisities other than int models and distribution definition for external procurement ?

Thanks

Amit