For anyone who might have been interested in the above problem, I talked to NS Support today, and there's a relatively easy fix! 1. Edit each affected asset record to make last depreciation date the last date depreciated correctly and set Depreciation Active to "false. 2. In FAM setup, click on "Reset Asset Values", wait until process complete 3. Edit again each asset record to make Depreciation Active True. 4. in FAM setup click on "precompute depreciation" 5. Voila! The dep history records have reset! 6. Run depreciation as usual.