DE-R-025-1
A Peppol Germany national rule (DE-R-*) – applies when the invoice is sent over the Peppol network to a receiver in Germany.
What this error means
DE-R-025-1
When both seller and buyer are located in Germany and the payment means is direct debit (BT-81: 59), the direct debit group (BG-19) must be provided.
How to fix it
In cac:PaymentMeans add cac:PaymentMandate with the mandate ID and payer account.