Diagnosis
You wanted to change the sources of supply for a promotion item forwhich prices have already been activated.
The sources of supply assigned in the promotion are used in theconditions once the purchase prices are stored.
A subsequent change to this data may mean that the promotion containsinconsistencies, if, for example, purchase prices are activated for avendor and stored as conditions, but this vendor is not visible in thepromotion because of the changes made to the sources of supply in thepromotion. Also, no purchase prices are stored for the new vendor, eventhough the activation status indicates that this is the case.

System Response
The source of supply is not changed.

Procedure
First delete the activated prices. You can then change the source ofsupply.