# BT-106 Sum of Invoice Line Net Amount

Sum of all Invoice line net amounts in the Invoice. This is the sum of BT-131 (Invoice line net amount) for all invoice lines.

> BT-106 (Sum of invoice line net amounts) is the total of all line-level net amounts (BT-131) before document-level allowances or charges. Mandatory under EN 16931, it must equal the arithmetic sum of every BT-131 to two decimals (BR-CO-10). Example: 1000.00.
>
> BT-106 · EN 16931 / XRechnung 3.x

## BT Reference Card

Canonical EN 16931 / XRechnung facts for this business term — citable from this anchor.

- **BT code**: BT-106
- **Name**: Sum of Invoice Line Net Amount
- **Cardinality**: Mandatory (M)
- **Business group**: BG-22 DOCUMENT TOTALS
- **Data type**: Amount
- **Example value**: 1000.00
- **Common error**: BR-CO-10: Sum of Invoice line net amounts (BT-106) shall equal the sum of all individual BT-131 (Invoice line net amount) values. Mismatches cause KoSIT to reject the document.

## Quick answer

Sum of all Invoice line net amounts in the Invoice. This is the sum of BT-131 (Invoice line net amount) for all invoice lines.

> **Taxes and totals**: VAT treatment, tax breakdowns, and document totals that validators check closely.

## In plain language

Sum of all Invoice line net amounts in the Invoice. This is the sum of BT-131 (Invoice line net amount) for all invoice lines.

Sum of all Invoice line net amounts in the Invoice. This is the sum of BT-131 (Invoice line net amount) for all invoice lines.

This represents the sum of all individual line items before any document-level allowances or charges are applied. It forms the basis for calculating the invoice total.

## What you usually enter here

Decimal number with up to 2 decimal places, non-negative

Typical valid values include: 1000.00, 2500.50, 0.00, 999999.99

Mandatory according to EN 16931-1. Must equal the mathematical sum of all BT-131 values in the invoice.

## What goes wrong often

Avoid values like: -100.00, 1000,50, 1.000.00, total

Relevant rule codes: BR-2, BR-12

## Examples in context

This represents the sum of all individual line items before any document-level allowances or charges are applied. It forms the basis for calculating the invoice total.

Mandatory according to EN 16931-1. Must equal the mathematical sum of all BT-131 values in the invoice.

## Valid Examples

- 1000.00
- 2500.50
- 0.00
- 999999.99

## Invalid Examples

- -100.00
- 1000,50
- 1.000.00
- total

## Related Fields

This represents the sum of all individual line items before any document-level allowances or charges are applied. It forms the basis for calculating the invoice total.

- [BT-131 Invoice line net amount](/resources/xrechnung/bt-131-invoice-line-net-amount)
- [BT-107 Sum of allowances on document level](/resources/xrechnung/bt-107-sum-of-allowances-on-document-level)
- [BT-108 Sum of charges on document level](/resources/xrechnung/bt-108-sum-of-charges-on-document-level)
- [BT-109 Invoice Total Amount Without VAT](/resources/xrechnung/bt-109-invoice-total-amount-without-vat)

## 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-106

### Data Type:
amount

### Cardinality:
1..1

### Requirement:
Mandatory

### Since Version:
XRechnung 1.0+

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:LegalMonetaryTotal/cbc:LineExtensionAmount
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementHeaderMonetarySummation/ram:LineTotalAmount
```

## Validation Rules

### BR-2
BR-2

### BR-12
BR-12

## Why the standard cares about this field

### Business Context
This represents the sum of all individual line items before any document-level allowances or charges are applied. It forms the basis for calculating the invoice total.

### Legal Requirement
Mandatory according to EN 16931-1. Must equal the mathematical sum of all BT-131 values in the invoice.

## FAQ

### How is BT-106 calculated?
BT-106 is the sum of all BT-131 (Invoice line net amount) values for every line item in the invoice.

### What is the difference between BT-106 and BT-109?
BT-106 is the sum of line amounts only, while BT-109 is BT-106 adjusted for document-level allowances (BT-107) and charges (BT-108).

## Official sources and tools

- [KoSIT Validator](https://erechnungsvalidator.service-bw.de/)
- [Invoice Converter](/pdf-to-xrechnung)
- [XRechnung Standard](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)