Reference
Markdown exportBT-29 Seller identifier
General identifier of the seller, for example a registry number or network identifier.
BT-29 (Seller identifier) is an additional identifier for the supplier — typically a GLN, DUNS, or scheme-qualified ID. Optional under EN 16931. Useful for buyers who route invoices on identifiers other than VAT. The scheme ID (e.g. 0088 for GLN) prefixes the value. Example: 0088:1234567890128.
BT-29 · EN 16931 / XRechnung 3.x
BT Reference Card
Key EN 16931 and XRechnung facts for this business term.
- BT code
BT-29- Name
- Seller identifier
- Cardinality
- Optional (O)
- Business group
- BG-4 SELLER
- Data type
- Identifier
- Example value
0088:1234567890128
Seller details
Who issued the invoice and how the recipient can identify that business reliably.
Quick actions
In plain language
General identifier of the seller, for example a registry number or network identifier.
This identifier helps buyers and automated systems identify the supplier even when names vary.
What you usually enter here
Structured seller identifier
Typical valid values include: 9930:DE123456789
Optional according to EN 16931-1, but one of BT-29, BT-30, or BT-31 is needed by BR-CO-26 to identify the seller automatically.
Where the field sits
- Invoice
- cac:AccountingSupplierParty
- cac:Party
- cac:PartyIdentification
- cbc:IDBT-29
- rsm:CrossIndustryInvoice
- rsm:SupplyChainTradeTransaction
- ram:ApplicableHeaderTradeAgreement
- ram:SellerTradeParty
- ram:IDBT-29
What goes wrong often
Avoid values like: seller
Relevant rule codes: BR-CO-26
Valid Examples
- 9930:DE123456789
Invalid Examples
- seller
XML mapping and field facts
Open the technical reference if you need XML paths, validator rule codes, legal wording, or schema-specific mapping details.
Field ID:
BT-29
Data Type:
identifier
Cardinality:
0..1
Requirement:
Optional
Max Length:
50 characters
XML Implementation
/Invoice/cac:AccountingSupplierParty/cac:Party/cac:PartyIdentification/cbc:ID/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerTradeParty/ram:IDValidation Rules
BR-CO-26
BR-CO-26
Next step
Check whether your XRechnung sets BT-29 correctly
Upload the XML file to the free validator. It applies the KoSIT rules for XRechnung 3.0 and names each finding with its rule ID, for this field for example BR-CO-26. Creating a new invoice instead? The converter checks the invoice against the same rules and shows the findings before download.
Free, no account needed. XML file up to 2 MB.