Process all dependent grouping WBS elements together

What causes this issue?

Grouping WBS element &V1& is not contained in the selection. This is a
requirement because of hierarchical dependencies.

System Response

Processing stops.

How to fix this error?

Include grouping WBS element &V1& in the selection to be processed.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.