SAP Message AP192 - Next higher WBS element is already assigned to a program position

Diagnosis
You want to assign WBS element &V1& to an investment program position.The system determined that WBS element &V2&, which is above your WBSelement in the hierarchy, is already assigned to an investment programposition.
In order to keep the hierarchy consistent, your assignment is notallowed.

System Response
The assignment is rejected.

206955EPS:Changing WBS hierarchy - error CJ468, AP192