# BT-131 — Invoice line net amount

> https://billhorse.com/en/terms/bt-131/

The line's net amount: quantity × price / price base quantity, minus line allowances (BT-136) plus line charges (BT-141). All BT-131 values must add up to BT-106 — round per line, then sum.

## Where does it live in the XML?

- UBL: `cac:InvoiceLine/cbc:LineExtensionAmount`
- CII: `ram:SpecifiedTradeSettlementLineMonetarySummation/ram:LineTotalAmount`

## Checked by these rules

- [BR-CO-10 — Line total mismatch](https://billhorse.com/en/rules/br-co-10/)