Reference
Markdown exportBT-126 Invoice line identifier
A unique identifier for the individual line item within the invoice.
BT-126 (Invoice line identifier) is the per-line index used to reference each invoice line uniquely within the document. Mandatory under EN 16931. Typically a sequential integer ("1", "2", "3"); reused across allowance/charge references. Must be unique within the invoice. Example: 1.
BT-126 · EN 16931 / XRechnung 3.x
BT Reference Card
Canonical EN 16931 / XRechnung facts for this business term — citable from this anchor.
- BT code
BT-126- Name
- Invoice line identifier
- Cardinality
- Mandatory (M)
- Business group
- BG-25 INVOICE LINE
- Data type
- Identifier
- Example value
1
Quick answer
A unique identifier for the individual line item within the invoice.
Line items
The goods or services on each invoice line, including quantities, prices, and VAT.
In plain language
A unique identifier for the individual line item within the invoice.
A unique identifier for the individual line item within the invoice.
Essential for referencing and processing individual line items in automated systems.
What you usually enter here
Unique identifier within the invoice, mirroring the original position number
Typical valid values include: 1, 2, 10, 001
Mandatory for each invoice line according to EN 16931-1.
What goes wrong often
Avoid values like: , 0, -1
Relevant rule codes: BR-2
Examples in context
Essential for referencing and processing individual line items in automated systems.
Mandatory for each invoice line according to EN 16931-1.
Valid Examples
Use these points as the practical checks for this section.
- 1
- 2
- 10
- 001
- 1.1.30
- 2.1.40
- LINE-001
Invalid Examples
Use these points as the practical checks for this section.
- 0
- -1
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-126
Data Type:
identifier
Cardinality:
1..1
Requirement:
Mandatory
Since Version:
XRechnung 1.0+
XML Implementation
/Invoice/cac:InvoiceLine/cbc:ID/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementLineMonetarySummation/ram:LineIDValidation Rules
BR-2
BR-2
Why the standard cares about this field
Business Context
Essential for referencing and processing individual line items in automated systems.
Legal Requirement
Mandatory for each invoice line according to EN 16931-1.