Base Quantity Support for Line Items

Invoice and credit note line items now support a base quantity field, so you can express prices that are based on a batch or pack rather than a single unit.

What changed

• New baseQuantity field on line items: An optional field that indicates how many units the netPriceAmount refers to. When omitted or set to "1", behaviour is unchanged — the price is per unit.
• Correct line amount calculation: When baseQuantity is greater than 1, the line amount is calculated as quantity * (netPriceAmount / baseQuantity), following PEPPOL rule EN16931-R120.
• UBL round-trip: BaseQuantity is written into the generated UBL XML when greater than 1, and parsed back from incoming documents.
• Document preview: The preview renders batch prices clearly, showing the price alongside the pack size (e.g. "51.98 / 10 pieces").

Why this matters

Many suppliers — especially in construction, hardware, and wholesale — quote prices per pack rather than per unit. For example, a box of 200 screws might be priced at 51.98 per 10 pieces. Without base quantity support, you'd have to calculate the per-unit price yourself and risk rounding differences that break Peppol validation.

With baseQuantity, you can now express prices exactly as they appear on the original quote:

• A line with quantity: "2", netPriceAmount: "73.47", and baseQuantity: "10" means "2 units ordered at a price of 73.47 per 10", giving a line total of 14.69
• A feed supplier invoicing 12000 kg of cow feed priced at 285.00 per 1000 kg: quantity: "12000", netPriceAmount: "285.00", baseQuantity: "1000" — line total of 3420.00
• A line with quantity: "5", netPriceAmount: "10.00", and baseQuantity: "1" (or omitted) works the same as before — 5 units at 10.00 each, totalling 50.00

This avoids manual per-unit price conversion and ensures your invoices stay compliant with the Peppol calculation rules.