If you entered the Cost of your Asset correctly, the depreciation on your return is correct. If you change the asset cost, the depreciation will recalculate for this year, but you shouldn't do that for any assets you've been depreciating over the years, only for new assets. You would need to file IRS Form 3115 to change your accounting method to recoup past depreciation not taken, and amend all affected year's returns.
If you can give more details on why you would need to override depreciation amounts, we'll try to help. You can't Efile with overrides in your return.
Here's more info on Rental Property Depreciation.
@sviyer
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