Spliting an order in multiple organizations to satisfy quantity

 Hello,

In order management, we want to be able to manage an order between 2 organizations. Those 2 organizations are in the same operating unit.

We have an order for an item with a quantity of 20. According to the sourcing rule define in PO, we should take from organization1. But the quantity on hand cannot satisfy the order; we have 15.

How can we handle to allow picking the missing quantity (5) in the organization2 instead of creating a BO?

Thanks!