Credit Management for Schedule Agreements?

Does anyone have a way to do Credit Management on Schedule Agreements?

Finance should have to release the Schedule Agreement every time a new release is received.

If this isn't possible, anyone know of a way to turn Credit Management on for Deliveries that are created against Schedule Agreements?

I created an entry in OVA8 for Delivery credit group, made it "static" and reaction "B".

Unfortunately, it doesn't stop me from creating deliveries against the schedule agreements that have been released in VKM4.

thanks for any ideas.