How can we credit any specific line of the invoice using web service or API or FBDI

Summary:

We have invoices created through a third party where revenue is subject to scheduling. Each invoice includes an accounting rule and revenue scheduling rule, along with revenue start and end dates. Recently, one of the lines got canceled in the third party system, and we need to integrate this cancellation into Oracle as well.

From what we understand, the web service for partial invoice cancellation is available. However, we need to know how to reference the specific invoice line number that needs to be credited.

If someone could provide a response with a workaround, that would be greatly appreciated. We are open to using FBDI or APIs if they can address our scenario.