Reference
Markdown exportBT-131 Invoice line net amount
The total amount of the invoice line after applying any item-level allowances or charges, but excluding VAT.
BT-131 (Invoice line net amount) is the post-line-discount, pre-VAT amount for one invoice line. Mandatory under EN 16931. Must equal BT-129 (quantity) × BT-146 (net price) minus any line allowances plus line charges (PEPPOL-EN16931-R120), to two decimals. Example: 100.00.
BT-131 · EN 16931 / XRechnung 3.x
BT Reference Card
Key EN 16931 and XRechnung facts for this business term.
- BT code
BT-131- Name
- Invoice line net amount
- Cardinality
- Mandatory (M)
- Business group
- BG-25 INVOICE LINE
- Data type
- Amount
- Example value
100.00- Common error
- PEPPOL-EN16931-R120: Invoice line net amount (BT-131) shall equal BT-129 (Quantity) × BT-146 (Item net price) ÷ BT-149 (base quantity), minus line allowances, plus line charges. Validator failures here are usually rounding errors. The sum of all line amounts must also equal BT-106 (BR-CO-10).
Quick answer
The total amount of the invoice line after applying any item-level allowances or charges, but excluding VAT.
Line items
The goods or services on each invoice line, including quantities, prices, and VAT.
Quick actions
In plain language
The total amount of the invoice line after applying any item-level allowances or charges, but excluding VAT.
The total amount of the invoice line after applying any item-level allowances or charges, but excluding VAT.
Used to calculate the invoice subtotal (BT-106) by summing all line net amounts.
What you usually enter here
Decimal number with up to 2 decimal places, non-negative
Typical valid values include: 100.00, 250.50, 0.00
Mandatory for each invoice line according to EN 16931-1.
What goes wrong often
Avoid values like: -100.00, 100,50, 1.000.00
Relevant rule codes: BR-24, BR-DEC-23, PEPPOL-EN16931-R120, BR-CO-10
Examples in context
Used to calculate the invoice subtotal (BT-106) by summing all line net amounts.
Mandatory for each invoice line according to EN 16931-1.
Valid Examples
- 100.00
- 250.50
- 0.00
Invalid Examples
- -100.00
- 100,50
- 1.000.00
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-131
Data Type:
amount
Cardinality:
1..1
Requirement:
Mandatory
Since Version:
XRechnung 1.0+
XML Implementation
/Invoice/cac:InvoiceLine/cbc:LineExtensionAmount/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementLineMonetarySummation/ram:LineTotalAmountValidation Rules
BR-24
BR-24
BR-DEC-23
BR-DEC-23
PEPPOL-EN16931-R120
PEPPOL-EN16931-R120
BR-CO-10
BR-CO-10
Next step
Check whether your XRechnung sets BT-131 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-24, BR-DEC-23. 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.
Why the standard cares about this field
Business Context
Used to calculate the invoice subtotal (BT-106) by summing all line net amounts.
Legal Requirement
Mandatory for each invoice line according to EN 16931-1.
FAQ
How is the Invoice line net amount (BT-131) calculated?
BT-131 is the line quantity (BT-129) times the net unit price (BT-146, divided by BT-149 base quantity), then minus line allowances (BT-136) and plus line charges (BT-141). It excludes VAT and is expressed in the document currency.
Why does BT-131 fail a BR-CO consistency check?
BR-CO-10 requires the sum of all BT-131 line amounts to equal the document line total (BT-106). Failures usually come from rounding the price×quantity result differently than the stated BT-131, or omitting a line allowance (BT-136) or charge (BT-141) from the formula.