In this step, you can specify to which of the previously defined supply
regions your plants belong. Each plant can be assigned to just one
region.
In the vendor master record, you can define which supply regions the vendor supplies.
When a purchase order is created, the system checks whether the vendor's supply regions agree with the supply regions of the plant for which the PO is being issued.
In the event of a discrepancy, a warning message is issued.
Assign your plants to supply regions.