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How to assign an invoice line item to a project using API?

Started by Anton Kuzmin -   in API Endpoints

Here is the description of how to do that via the UI
https://www.xero.com/content/dam/xero/education/public/gl/xero-project-for-smb/create-projects-invoices/index.html#/page/5c061eee616d647acb99ff24

However, It seems that there is no way to create project invoices or assign line items to projects using the API. I checked both https://developer.xero.com/documentation/api/items and https://developer.xero.com/documentation/api/invoices and couldn't find how to do that.

Any help is much appreciated.