> ## Documentation Index
> Fetch the complete documentation index at: https://developer.jtl-software.com/llms.txt
> Use this file to discover all available pages before exploring further.

# CancelSalesInvoice

> Cancels a sales invoice.



**mutation** `CancelSalesInvoice(request: CancelSalesInvoiceCommandRequestInput!): Boolean!`

## Arguments

**`request`**: `CancelSalesInvoiceCommandRequestInput!` (required)

## Returns

`Boolean!`