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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

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.