As i know CAT2 for record time sheet for internal / external employees,
1).And its advantage from PM Side is once we approve time sheet , by transaction CAT 9. we transfer work hours and auto confirmation will done and the same update in maintenance order.
2) And for CAT2 once time recorded CATM, System will generating service entry sheet. But any way we can create service entry sheet through , PO also . so what is advantages.Of Cats here. please answer some one if any idea..