Hi Shriya
1. Yes you can use Unplanned Depreciation
2. But remember that Unplanned Depreciation does not impact the NBV at the Start of The Year.
Eg: APC 10000 (2013) and Depreciation of PY is 2000. So, NBV at the start of 2016 should be 8000
But because you are posting Unplanned Dep in 2016, the NBV at start of year is 10000 and not 8000
3. So if your depreciation is based on NBV, depreciation values in 2016 would still be wrong.. So you will have to post another Unplanned Depreciation towards the end of 2016 so that the NBV at the start of 2017 is Correct
Hope this helps
Ajay M