BR-DEX-10

The rule applies to cac:PrepaidPayment elements when the invoice declares the XRechnung extension via cbc:CustomizationID. If such a group (BG-DEX-09) is present, the cbc:ID element, which carries the “Third party payment type” (BT-DEX-001), must be present and contain a non-whitespace value. A document fails validation if a PrepaidPayment group exists in this context but cbc:ID is missing or empty (including whitespace-only).

For each cac:PrepaidPayment in the extension invoice, add a cbc:ID element with a non-empty value representing BT-DEX-001. If a particular PrepaidPayment group is not needed, remove it. If it is needed, ensure the cbc:ID is not empty and that the value is valid according to the applicable code list for this element.