Hi Pankaj
Never tried this, so I will be honest that I am experimenting on you
The settings lies in OAVH for period controls.. Here you can see how it is designed
You can try with 24 instead of 12 after 31 i.e. Year = Blank, M = 12, Day = 31 and Period = 24
Try this and see if it works..
When you assign Period = 24, it means that Dep should start after 24 months
Br. Ajay M