Diagnosis
There are mixed account assignments in the purchase order. This is notpermitted for a purchase order that has a down payment chain (DPC)linked.

System Response
Mixed account assignments are not possible. For example, in multipleaccount assignments it is not possible to have the first account with aWBS element and the second with a Network Order.
All the account assignments must be of the same category.

Procedure
Maintain valid account assignments.