how to do this question

[user_20]

The 'priority' field on the incident form should be editable only by users with the 'manager' role

[AndersBGS]

Hi @user_20 ,

As @Ankur Bawiskar  has correctly stated, priority is based on impact and urgency according to priority matrix. If you have this requirement, then you could create an ACL for impact and urgency based on defined role. But if you do this, then you also need to take into consideration that no one else would be able to change these fields. 

[pranita-24]

Hi @user_20 
please try by using client script

function onLoad() {
if (!g_user.hasRole('manager')) {
g_form.setReadOnly('priority', true);
}
}