PDI Event-OnDelete is not trigerring

Hi all,

OnDelete event is not being triggered (firstly, a record has been removed on CurrentEmployeeResponsible node by pressing trash icon on the list) after pressing save button of COD_Account_TI (Customer object) for the CurrentEmployeeResponsible node. Have anyone tried to implement this event or same event for other Standard Business Objects before? I've also tried to implement OnDelete event for a node of my custom BO, and it is working properly.