Depreciation calculation on GRN date

I have a situation where some assets are calculating depreciation on GRN date instead of Asset Value date.

Asset value date is 01.01.2015 but GRN is 30.11.2015.

How do I fix this? I cannot assign the manual depreciation key as one posting is already done.

Is it possible to reverse the Dep run and redo it?

Thanks in advance

Siddhi