Hi Mahmoud
We may need some more info from you on this. This doesn't seem like it is doing the right thing.
When you click Recalculate, it actually recalculates the current year's depreciation based on the changes, will take off what it already posted and spread the remainder for the rest of the year.
In your example, if my sums are right, prior to making the change, your monthly depreciation rate was $215,715.58 - annual rate $2,588,586.
After the recalculate, you are expecting them to be $179,762.98 for the remainder of the life - annual rate $2,157,155.
So, if you had already processed say 5 months depreciation, you would already have $1,078.575 posted and only need another $1,078.580 - which would mean $154,082 per month for the rest of the year. Then next year, it would post $179,762.98.
Now there are other impacts to depreciation calculations - depreciation method, averaging convention.
I would suggest that to get the result you are after, you would need to use SL Remaining Life.
If you can give us these details, we may be able to better advise:
Original cost
Place in Service date
Averaging Convention
Depreciation method
FA Year End date
Cheers
Heather