This endpoint is currently in Beta and available for testing. It may contain bugs, and breaking changes can occur at any time without prior notice. We do not recommend using Beta endpoints in production environments. Should you choose to use it in production, you assume full responsibility for any resulting issues.

This endpoint requires the following scopes: supplierInvoice:update.

Assign a purchase order to a supplier invoice. An invoice can be split across several purchase orders, and the same purchase order can be assigned more than once, each assignment stating its own share of the invoice. Nothing is taken over from either document, and assignments never change the totals of the invoice.