Field help (NSPVALP) 

When any revaluation or impairment loss processing has been carried out on the current period (or the current exercise if the periods are not managed), this field is used to enter the market value of the asset. The amount entered is copied on each managed plans of the company, converted in the currency of the plan if this one is different from the company currency. When a revaluation or impairment loss processing has already been carried out on the current period (or the current fiscal year), this field is empty and cannot be entered.