By using ACL Make the field affected user read only for ITIL users,

[rajachodisetti]

By using ACL Make the field affected user read only for ITIL users, Admin can read and edit this field, For NON-ITIL users make this field hidden
#acl 

[Sohail Khilji]

Hi @rajachodisetti ,

Can you let me know which table are you attempting to apply the ACL ?

[rajachodisetti]

on incident table

[Harish KM · Accepted solution]

Hi create a write ACL,

select the table and field

and in role select itil

advanced script write

answer = false; // this will make the field read only

[rajachodisetti]

 and also

Admin can read and edit this field, For NON-ITIL users make this field hidden