Managed to get it to work. I used the following code:
function onCondition() {
var grpName = 'Service Assurance';
var usrID = g_user.userID;
var grp = new GlideRecord('sys_user_grmember');
grp.addQuery('group.name', grpName);
grp.addQuery('user', usrID);
grp.query(groupMemberCallback);
function groupMemberCallback(grp){
if(grp.next()){
g_form.setMandatory('u_actions_taken', false);
g_form.setMandatory('u_lessons_learned___proactive_', false);
g_form.setMandatory('u_root_cause', false);
g_form.setMandatory('u_updated_documentation', false);
g_form.setMandatory('u_vendor_report', false);
}
}
}
