Diagnosis
Based on the Customizing settings for transaction &V1&, this transactioncan only be executed in display mode. For this reason, all othersub-functions of this transaction that you want to set up in Customizingwill only run in display mode only.

System Response
The system will not allow you to make any new entries in the field &V2&and automatically sets the field to the default value Display

Procedure
If you want to enable a sub-function to be run in change mode, you mustchange the mode of the transaction itself from Display toChange.