errorDEPEPPOL_BIS

DE-R-022:Duplicate attachment filename. All attached documents in German invoices must have unique filenames (case-insensitive) i

Duplicate attachment filename. All attached documents in German invoices must have unique filenames (case-insensitive) in element BT-125.

Why This Error Matters

Invoice will be rejected by German XRechnung validators. German e-invoicing has specific format requirements for payment details, contact information, and attachments.

Common Causes

  • Attached document filenames not unique
  • BT-125 contains duplicate filename (case insensitive)
  • Multiple attachments with same name in BG-24
  • cbc:EmbeddedDocumentBinaryObject/@filename duplicated
  • File naming collision in additional supporting documents

Frequently Asked Questions

Duplicate attachment filename. All attached documents in German invoices must have unique filenames (case-insensitive) in element BT-125.
Duplicate attachment filename. All attached documents in German invoices must have unique filenames (case-insensitive) in element BT-125. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, DE-R-022 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted.
Many instances of DE-R-022 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues.

See Also

🇩🇪

E-Invoicing in Germany

Requirements & common errors

Last updated: 16 January 2026

Share this guide: