The allowed maximum number of decimals for the Invoice total VAT amount (BT-110) is 2.
/ubl:Invoice | /cn:CreditNote
(//cac:TaxTotal/cbc:TaxAmount[@currencyID = cbc:DocumentCurrencyCode] and (string-length(substring-after(//cac:TaxTotal/cbc:TaxAmount[@currencyID = cbc:DocumentCurrencyCode],'.'))<=2)) or (not(//cac:TaxTotal/cbc:TaxAmount[@currencyID = cbc:DocumentCurrencyCode]))