# BT-148 Invoice line allowance charge base amount

The base amount to which the allowance/charge percentage is applied at line level.

## Quick answer

The base amount to which the allowance/charge percentage is applied at line level.

> **Line items**: The goods or services on each invoice line, including quantities, prices, and VAT.

## In plain language

The base amount to which the allowance/charge percentage is applied at line level.

The base amount to which the allowance/charge percentage is applied at line level.

Typically the line net amount before allowances/charges.

## What you usually enter here

Decimal number with up to 2 decimal places

Typical valid values include: 1000.00, 250.50, 0.00

Optional according to EN 16931-1.

## What goes wrong often

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

Relevant rule codes: BR-2

## Examples in context

Typically the line net amount before allowances/charges.

Optional according to EN 16931-1.

## Valid Examples

- 1000.00
- 250.50
- 0.00

## Invalid Examples

- -100.00
- 1000,50
- 1.000.00

## Related Fields

Typically the line net amount before allowances/charges.

- [BT-146 Invoice line allowance charge indicator](/resources/xrechnung/bt-146-invoice-line-allowance-charge-indicator)
- [BT-147 Invoice line allowance charge percentage](/resources/xrechnung/bt-147-invoice-line-allowance-charge-percentage)
- [BT-149 Invoice line allowance charge amount](/resources/xrechnung/bt-149-invoice-line-allowance-charge-amount)

## 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-148

### Data Type:
amount

### Cardinality:
0..1

### Requirement:
Optional

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:InvoiceLine/cac:AllowanceCharge/cbc:BaseAmount
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementLineMonetarySummation/ram:SpecifiedTradeAllowanceCharge/ram:BasisAmount
```

## Validation Rules

### BR-2
BR-2

## Why the standard cares about this field

### Business Context
Typically the line net amount before allowances/charges.

### Legal Requirement
Optional according to EN 16931-1.

## 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)