SAP Message 7A071 - "Estimates" for percentage of completion is not allowed

Diagnosis
Estimates is not a valid technique for determining the percentage ofcompletion in the object(s) you selected.

System Response
INCLUDE 'NA_ALLG_NOFUNKTION' OBJECT DOKU ID TX

Procedure
You determine how the percentage of completion is calculated for anobject by selecting a measurement method and assigning it to the object.