How can I amend a purch. order created by the MRP before approval?

Hi, On my particular implementation of SBO, all purchase orders are submitted for approval before they can be raised. I am implementing the MRP processes which allows be use view the recommendations and create the purchase orders automatically. These new purchase orders are immediately submitted for approval. This causes a problem as I need to amend the purchase orders manually before I want to submit thyem for approval. The information I need to amend on the purchase order include the row project code and the owner and buyer.

Is there a way to allow this? Maybe the MRP can save draft purchase orders that allow me to amend before approval?

Thanks!

Simon