Hello,
in your case I would:
1. Create new field on the table, type choice list, with "Yes, "No" and with "none" option avaible and default.
2. Create Business Rule with condition "Additional comment -> changes" and action to set your field to "No". Then create list style with value "javascript:current.name_of_your_fiedl == 'No'". This way you have style for the incidents that has been commented. Also you can in BR add other conditions to set this field accordingly.
3. Create Client Script on load, something like this:
function onLoad() {
//Type appropriate comment here, and begin script below
if(g_form.getValue('u_user_has_read') == 'no' & g_user.userID == g_form.getValue('caller_id')){
g_form.setValue('u_user_has_read'', 'yes');
g_form.save();
}
}
This way you will make sure that the Caller has read (or opened the form). The line "g_form.save()" is optional, will cause re-render of the page, but ensure that when the caller have opened the record this fact has been noted by the system.
(As alternative to the Client Script you can for example create UI Action called for example "Mark as Read" that caller will click. Also maybe even this approach will be better.)
Then create list style with value "javascript:current.name_of_your_fiedl == 'Yes'".
