Field help (FASRSDVAL) 

The residual value is the sales price estimated at the end of the asset use.
This value will as an option:
- Minor the Depreciation basis, in order to determine its Depreciable value.
-
Minor theNet value of the fixed asset, in order to determine its Depreciable net value, and this, in the case of a long-term revision of the depreciation plan.

This residual value can be revised via the Fixed assets revision function.