WBS element & is not a billing element

What causes this issue?

Because the WBS element &V1& is not defined as a
<GL:billing_element>billing element</>, you cannot post any revenues to
it.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

You can correct this by entering a WBS element that is defined as a WBS
billing element.
If you want to invoice WBS element &V1&, you must first get it changed
to a billing element by authorized personnel for example, the
system administrator or the project manager.


Procedure for system administrator:
Set the billing indicator for WBS element &V1&.

Error message extract from SAP system. Copyright SAP SE.