Automatically process Purchase Order Direct 1:1 ration

Hi,

We are on Apps10 - looking at a way of ensuring 1 Purchase Order Direct CO line will go to 1 Purchase Order. 

We are using Order Processing Types to go straight to Released PO. 

It could be collecting a number of CO lines and putting onto 1 PO. We could also accept 1 CO linking to 1 PO - e.g. 3 products on the same PO that relate to the 1CO, but not another 4 that relate to a different one.

Would like Standard functionally - but well versed in Custom Config if that is needed.

Edit: just to add - we are using Non-Inventory Sales Parts sourced from a Non-Inventory Purchase Part.

Many thanks,

Matt