Hello Mário,
It is controlled from SPRO Tcode OIAL.
OR
spro path:
Plant Maintenance and Customer Service > Maintenance and Service Processing > Maintenance and Service Notifications > Notification Creation > Notification Types > Set Field Selection for Notifications > Field Selection for Maintenance Notifications.
Now,
If you are finding this greyed-out fields in all Notification types, then you need to change the following settings in initial screen itself. If it is the case of a particular Notification Type then use Influencing button in the initial screen and Gvie Notification Type > Press Enter button > and then do the following settings.
As per your problem description, the fields you named are in Disp setting, which you need to change to Input as shown below.:
Regards
KJogeswaraRao
PS: Please close your earlier thread. Because you are new to SCN, please go through this link in this context: How to close a discussion and why