Monthly Depreciation varaince in migrated system for one of assets

Oracle ebs 12.2.9

Hi expert, recently, I have migrated open assets & found depreciation variance in one of Tax books for 30 plus assets.

hence, by using a workaround like a change in asset cost by reducing 0.1 & checking the amortized rate with the latest date & vice versa, can see issue got resolved & can able to see the monthly depreciation amount is as per the source system in the target system but still one asset have some variance and by using override depreciation option can solve this but this need to be done on every month basis & leads to manual work by the user.