/// <summary>
///
/// </summary>
private void update_UnitPriceVAT()
{
UnitCost_Vat = Vat.return_ValueWithVAT((int)id_vat_group, _unit_cost);
RaisePropertyChanged("UnitCost_Vat");
}
/// <summary>
///
/// </summary>
/// <param name="discount"></param>
public void Calculate_UnitVatDiscount(decimal discount)
{
_DiscountVat = Vat.return_ValueWithVAT((int)id_vat_group, discount);
Calculate_SubTotalVatDiscount(_DiscountVat);
RaisePropertyChanged("DiscountVat");
}