DE-R-010
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-010
When both seller and buyer are located in Germany and a deliver-to address (BG-15) is given, the deliver-to city (BT-77) must be provided.
How to fix it
Fill in cbc:CityName in the cac:Delivery address block.