No. of project sections does not agree with project mask "&"

What causes this issue?

You have entered the key for the project definition in a different form
than it was defined.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Enter the key for the project definition in the following form:
&V1&.

Error message extract from SAP system. Copyright SAP SE.