SAP Message AO095 - WBS element &1 is not a top WBS element - please correct

Diagnosis
You assigned WBS element &V1& to the appropriation request.

System Response
You can only assign the WBS element that is at the highest position inthe work breakdown structure (the top WBS element) to appropriationrequests.

Procedure
Choose a top WBS element or remove your entry.

390174Appropriation request: only level 1 WBS element assignable
1652980Downgrading poss despite connectn to appropriation request