User Activity

Hi all, I have brought the OOB Escalation field on the incident form, We can see there are 4 dropdown values under that field.But when I am trying to set any values on that field it is reverting to its original value which is "Normal" Can anyone plea...
Some users are not able to see catalog items because they dont have itil roles ...   we can not directly give the itil roles... can anyone knows which training nee d to complete...