# HAP1650-6e

Source: https://xmlvalid.com/rules/HAP1650-6e

> TotalGrossAmountBeforeTaxes (…) must be TotalGrossAmount - TotalGeneralDiscounts + TotalGeneralSurcharges (…).

- Level: error
- Rule sets: Facturae validation rules of the Spanish public sector Orden HAP/1650/2015, Facturae 3.2.x description of 6 June 2017
- Context: `/*:Facturae/*:Invoices/*:Invoice`
- Test: `abs($before - ($gross - $discounts + $charges)) le $tolerance`

Validate a document against these rules: https://xmlvalid.com/validate