SAP Message BRAIN839 - Activity (ACTVT) field could not be added to &1

Diagnosis The field 'Activity' (ACTVT) must be added to authorization object &V1&to be able to check the activity. Authorization object &v1& does notcontain the field 'Activity', but also has no free fields left. System Response The field 'Activity' cannot be checked. Procedure Include the field 'Activity' in your authorization objects. Otherwise,these cannot be checked.