I have added notification type field using UI annotation in the "create maintenance request" app. I want to restrict values which are coming in dropdown for this field. Currently, it fetches Y1, M1, M2, M3, M4, M5 values but I want it to show only M1 and M5. How can it be achieved?

This field is using following value Help in the projection view C_MAINTWORKREQUESTOVERVIEWTP:

Value help I_PMNotificationTypeStdVH fetches data from I_PMNotificationType and has @accesControl.authorizationCheck active.

Please suggest how can I restrict values for this dropdown?