Purchasing Controls - Purchase Orders from Purchase Requisitions

Question

I need some help with setting up purchasing controls.  We are looking to put in place a control that allows users to convert purchase requisitions into PO, but only create the purchase order for the quantity on the purchase requisition.
As I see it, we need to do the following:
1) Require that PO references a Purchase Requisition
2) Do not allow the PO qty to exceed the Purchase Requisition qty
Background
- Purchase Requisition approval not needed for reqs created by MRP
- Have investigated transaction OMET and function authorization, but does not fit the need.  If we require Purchase Req as reference, it does not allow reference to Contract.  If we select contract and purchase requisition, a PO can be created referencing Contract without a purchase requisition.
Regards,
Jeff

Answer 1

1) Require that PO references a Purchase Requisition
Use OMET adn do not select the ref to contract check box but select the ref to Purchase requistion
now make the source list is required for mateiral and than create the source list and enter the contract in the source list.
now  when user create the req and the source determination is check than system will put the contract as source in reqs and than you can create the PO using reqs.
2) Do not allow the PO qty to exceed the Purchase Requisition qty
Activate the message an error :  06 076 Materials of requisition & item & alr. ordered in full
which will stop user to alter the quantity in the PO and will not allow to use again same reqs if orderd full