/// <summary>
///
/// </summary>
/// <param name="discountvat"></param>
public void Calculate_UnitDiscount(decimal discountvat)
{
decimal calc_discount = Vat.return_ValueWithoutVAT((int)id_vat_group, discountvat);
ApplyDiscount_UnitPrice(_discount, calc_discount, unit_price);
_discount = calc_discount;
Calculate_SubTotalDiscount(_discount);
RaisePropertyChanged("discount");
}
/// <summary>
///
/// </summary>
private void update_UnitPrice_WithoutVAT()
{
unit_cost = Vat.return_ValueWithoutVAT((int)id_vat_group, UnitCost_Vat);
RaisePropertyChanged("unit_cost");
}