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"Sales Invoice Entity" API does bring back data from Posted and Unposted documents. However, receving end of this dataset does not have a way to identify which is posted and which is not.

Current “Status” field in the API does not reflect if the invoice posted or not. It is to check if the invoice in “Draft, In Review, Open, Paid, Canceled, Corrective” status.
Category: Development
STATUS DETAILS
Needs Votes
Ideas Administrator

Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future.

Best regards,
Business Central Team