Unplanned Depreciation in last period

Dear all,

In 11.5.10 instance last period of asset,

Customer enter Unplanned Depreciation amount as 3380 (not exceed NBV value) but after run depreciation, it become 3373.

According to Doc.ID 417513.1 Depreciation Override Amount Did Not Apply As Expected For Assets That Are In the Last Period of Life, it states that use "Unplanned Depreciation" instead of "depreciation override" (in the last period of life). But in this case, Unplanned Depreciation also not work as expect.

Can anybody suggest here if we are missing some steps.

Thanks a lot!!

Angie