BT-1 Invoice number

What is BT-1 in e-invoice and how is it related to the invoice number?

⚠ Machine-translated answer, not yet manually reviewed. For the exact wording, see the Slovak original.

Short answer

BT-1 is the official designation of the business term invoice serial number according to the European standard EN 16931. In the UBL XML structure used by Peppol BIS Billing 3.0, it is written as an element cbc:ID directly in the document header. It is not a technical Peppol identifier, but the same invoice number that the supplier uses in a paper or PDF invoice.

BT-1

Serial number of the invoice

Business term EN 16931, in UBL element cbc:ID.

BR-2

It must exist

Peppol/EN16931 validation only checks the presence of the field, not the format.

Number board

It is governed by Slovak law

Continuity and continuity of numbers is controlled by the Accounting Act, not the XML validator.

Same number

No duplicate numbering

BT-1 in XML = the same number as in the PDF preview of the invoice.

Conclusion

BT-1 is the EN 16931 business term for the serial number of the invoice, entered in the UBL as cbc:ID, and must correspond to the same number as the company keeps in its legal, uninterrupted number series.

Sources

  • Law no. 222/2004 Z. z. Coll. on VAT, § 74 ods. 1 letter b)
  • Law no. 431/2002 Z. z. Coll. on accounting, § 9
  • EN 16931 and Peppol BIS Billing 3.0: business term BT-1 / element cbc:ID

Not legal advice. Machine-translated answer, not yet manually reviewed. For the exact wording, see the Slovak original.