We are using Odoo 17 Online (Enterprise) with POS, cash rounding enabled (Belgium), and PEPPOL e-invoicing.

We encounter a PEPPOL Schematron error BR-CO-16 when sending B2B cash sales with invoice via PEPPOL.

Example:

• Invoice total (incl. VAT): €70.51

• POS cash payment (rounded): €70.50

• Difference due to legal cash rounding: €0.01

Odoo POS applies rounding on the payment, but the rounding is not explicitly represented on the invoice nor mapped to BT-114 (RoundingAmount) in the PEPPOL XML.

As a result, the PEPPOL validation fails because: BT-115 ≠ BT-112 − BT-113 + BT-114

This seems to be a structural limitation of Odoo POS + PEPPOL, especially on Odoo Online, where XML mapping cannot be customized.

Questions to other Odoo POS/PEPPOL users:

• How do you handle B2B cash sales with legal cash rounding and PEPPOL?

• Do you avoid POS invoices for B2B cash sales?

• Is there any supported workaround to correctly include cash rounding in PEPPOL (BT-114)?

• Any official Odoo guidance or roadmap on this?

Thanks in advance for sharing your experience.