WBS element & is not released

What causes this issue?

WBS element &V1& does not yet have the status "released". In this
situation, you cannot assign the order.

System Response

INCLUDE 'NA_ALLG_NOFUNKTION' OBJECT DOKU ID TX

How to fix this error?

Release WBS element &V1&.

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.