WBS element & is marked for deletion

What causes this issue?

A deletion flag has been set for WBS element &V1&.
You cannot make an account assignment to this WBS element.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Check whether you have maintained the correct key for the WBS element.
<ZH>or</>
Reset the deletion flag in the work breakdown structure.

Error message extract from SAP system. Copyright SAP SE.