Quittio 0.3 API

Amounts are rounded half up to two decimals at the defined points only. VAT is calculated per VAT group (category and rate), not per line (BR-CO-17).

With Meta::FLAG_DECLARED_AMOUNTS (cancellations and unchanged data of InvoiceBuilder::from() whose declared amounts another system rounded differently) and a matching fingerprint of the amount inputs (DeclaredAmounts), declared line net amounts (BT-131) within 0.02 of quantity × price ± allowances and charges (PEPPOL-EN16931-R120) and declared VAT category tax amounts (BT-117) less than one currency unit from the recalculation (BR-CO-17) are kept; otherwise the recalculated amounts are used and Meta::FLAG_DECLARED_AMOUNTS_RECALCULATED is set (QUITTIO-DECLARED-AMOUNTS). Data whose amount inputs changed after the amounts were declared (fingerprint mismatch, e.g. a change with with() or in stored JSON) is recalculated completely. A declared VAT total in accounting currency (BT-111, Meta::declaredVatInTaxCurrency()) is kept within 0.01 of round2(BT-110 × exchange rate), e.g. the BT-111 of a partial cancellation aligned with the earlier ones (Corrections\CancellationHistory). In gross price mode the rounding amount (BT-114) follows the amounts finally used, so that the amount due stays the gross amount of the lines. The CalculationPolicy decides whether declared amounts are kept, recalculated or rejected.