Diagnosis
The transfer structure contains fields to which an inactive InfoObjector to which no InfoObject has been assigned. However, field propertiescan only be obtained if the transfer structure field is assigned to anactive InfoObject.

System Response
The transfer structure fields that were assigned to no/an inactiveInfoObject cannot be used in the formula editor.

Procedure
To use a transfer structure field in the formula editor, you need tomap the field to an active InfoObject.