PM Close Notifications

Hi experts,

PM close Notifications are not getting triggered.

in Problem Management, we have 3 notifications. PM Open, PM Update, PM Close

PM open and PM Update are working fine. PM Close is not working. When i checked in, Object of Rootcause table, under notifications, it has been defined as,

Add: PM Open

Update: PM Update

Delete: (nothing).

Because of this configuration both were working fine. now where should i configure For PM close to get triggered?

Any suggestions are appreciated.

Thanks & Regards,

Shalini R