Please add the Milestone object column in the Coupa connector.
This information is about Pre-payment. This object is new and was included in 2022 by the Coupa team.

The most important tables where the milestone object most appear are: Order Header,  Order Header Change and Order Line.

Please refer to the documentation for more information: https://compass.coupa.com/en-us/products/product-documentation/integration-technical-documentation/the-coupa-core-api/resources/transactional-resources/purchase-orders-api-(purchase_orders)/purchase-order-lines-api

Thank you.