Field help (IVCVATAMTI) 

The amount of invoiced VAT of the asset is calculated from the IAS/IFRS ex-tax receipt value to which the invoiced VAT is applied for the IAS/IFRS. This amount is expressed in folder currency.
In creation mode, the calculated value can thus be forced. The entered amount must have the same sign as the Ex-tax entry valueand be lower than this entry value.
When you enter this amount,you can select Recalculation by application from the Action icon in the field to cancel the entry and automatically recalculate this amount from the ex-tax entry value and invoiced VAT rate.
Once the creation is complete, this value cannot be directly modified in this screen; click Refresh to update.
If the asset is composed of the capitalization of expenses, this value is not calculated from the displayed rate: it is forced with the total of invoiced VAT amounts of the attached expenses. It can be updated by adding new expenses or withdrawing already attached expenses.