VAT Costs
The cost that you either pay or receive for VAT. VAT is calculated based on the Base Cost you enter and the VAT Percent associated with the cost's cost category. You can also manually enter a VAT Percent Override or VAT Amount Override when entering costs that are exceptions to the default VAT percent defined for the cost category.
Archibus applications use this field only if you have enabled the Archibus Enhanced Global Feature Set.
See Amount Expense - VAT and Amount Income - VAT.