We are updating from image 29 to 33. We have noticed that the contract controls option is new to im

We are updating from image  29 to 33.  We have noticed that the contract controls option is new to image 30.  We have existing contracts that we setup for multiple busines units via the PO defaults.  Our issue/question is if we want to update an existing contract to allow all business unit access for purchase orders, in image 29, we just select the Corporate check box and this opens it for all purchasing business units.  With the new contract controls, it only allows those business units listed in the contract controls section on the contract.  We are concerned that we