Diagnosis
Field &V1& is either a description for another field or a special,nonchangeable field (such as the fields Changed On,
Changed By , Created On, and Created By
). These fields can only have the display types Text View
or Link.
Likewise, for the key fields of dependent entity types, you also canselect only the display types Text View or Link
.

Procedure
For field &V1&, select either the display type Text View
or Link.