BR-CO-15: Invoice total amount with VAT (BT-112) = Invoice total amount without VAT (BT-109) +…

BR-CO-15 is a fatal rule: the invoice total amount with VAT (BT-112) must equal the invoice total amount without VAT (BT-109) plus the invoice total VAT amount (BT-110), calculated in the invoice currency and rounded to two decimal places. In UBL this means cbc:TaxInclusiveAmount must equal the rounded sum of cbc:TaxExclusiveAmount and the one cbc:TaxAmount with @currencyID equal to cbc:DocumentCurrencyCode; there must be exactly one such cbc:TaxAmount. A document fails if the rounded sum does not match, or if the cbc:TaxAmount count is zero or more than one. In CII, the same equality applies to the monetary summation amounts, but an additional accepted condition is ram:GrandTotalAmount equal to ram:TaxBasisTotalAmount.

Check the amounts in the invoice currency. If cbc:TaxInclusiveAmount was entered manually, set it to the result of round((cbc:TaxExclusiveAmount + cbc:TaxAmount) * 100) div 100. Ensure cac:TaxTotal contains exactly one cbc:TaxAmount with @currencyID matching cbc:DocumentCurrencyCode; remove duplicates or add the missing tax total amount if needed. For CII, apply the same corrections to ram:GrandTotalAmount, ram:TaxBasisTotalAmount, and ram:TaxTotalAmount, or use the accepted condition where ram:GrandTotalAmount equals ram:TaxBasisTotalAmount.