# BR-DEC-28

> The allowed maximum number of decimals for the Invoice line charge base amount (BT-142) is 2.

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/br-dec-28

## Official rule text

The allowed maximum number of decimals for the Invoice line charge base amount (BT-142) is 2.

## Why did my invoice fail BR-DEC-28?

The Invoice line charge base amount (BT-142), the amount the line-level charge percentage is applied to, may have at most two decimal places. Constraining the base to currency precision ensures the charge amount (base x percentage) is reproducible and reconciles.

## Common causes

- Deriving the base from an unrounded intermediate value
- Currency conversion of the base producing 3+ decimals
- Serializing full precision instead of quantizing to 2 places

## How do I fix it?

```
Round the charge base amount: <cac:AllowanceCharge><cbc:ChargeIndicator>true</cbc:ChargeIndicator><cbc:BaseAmount currencyID="EUR">100.00</cbc:BaseAmount></cac:AllowanceCharge>
```