2019-04-07 00:00:00 Quickly calculate the values ​​of net value, IGV (general sales tax) and total value, from only one of these data. The fields are filled automatically. It allows the change of the value of the IGV percentage (18% current), which allows it to be used for other countries (VAT calculation). In the invoice section, you can perform the calculations of these values ​​in the invoices, being able to choose between including in the calculation the value of the IGV or with IGV not included, in addition it allows to include all the products that you want without any limit.