I have a User Picker Field called R2V_AE_Name where user can pick a name from the User Picker popup window. When a User select somebody else instead of his/her name, the system does not catch them or does not validate whether it is correct or not. Is there a way to put a condition/validation like the R2V_AE_Name has to belong to a Group or his/her log in name has to match the system name as logged in.