# BR-DEC-09

> The allowed maximum number of decimals for the Sum of Invoice line net amount (BT-106) is 2.

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/br-dec-09

## Official rule text

The allowed maximum number of decimals for the Sum of Invoice line net amount (BT-106) is 2.

## Why did my invoice fail BR-DEC-09?

The Sum of Invoice line net amounts (BT-106), which totals every line's net amount, must be expressed with at most two decimals. As a monetary total feeding the document totals block, it is capped at 2 decimals so it reconciles with the taxable amount and grand total.

## Common causes

- Summing line amounts that were themselves not rounded to 2 decimals
- Emitting an accumulator held in floating point with residual precision
- Aggregating values converted from another currency mid-calculation

## How do I fix it?

```
Round the sum before writing: <cbc:LineExtensionAmount currencyID="EUR">2450.00</cbc:LineExtensionAmount> in cac:LegalMonetaryTotal.
```