Field help (OSTCTL1) 

Select the type of control that you want to apply on the customer credit amount:

The WIP is controlled with respect to the risk BP of the customer. If the risk BP is shared by several customers, it means that the WIP of each customer will be controlled the same way with respect to the risk BP by cumulating the total of the different customers movements.
When the customer is associated to a different risk BP, the amount of the authorized WIP cannot be accessed. It can be viewed on the risk BP record. The displayed WIP is the risk BP,