Hello Dear,
It is a difference calculation logic for old and new depreciation engine,I guess you have activated EA-FIN after upgrading. And if we run report in a middle date or run AW01N,system will recalculate the asset.
And under new epreciation engin logic,system found net book value break the rules(ususlly,net book
value blow zero according to the date),so you will get error AA660.
You may try set flag "Negative value allowed" via AS02 to solve this issue.
By the way,if you run report with the end date of fiscal year,you will not get the error as in this case system will not recalculate the asset.And for the difference of old and new depreciation engine,please refer to note 965032.
Best regards.
Beam