If I were you, I would have tested with a document and see how it is working. Please test in your system and update here what you see. For information, if you see the description of this standard transaction MCV9, it says, "Incomplete SD Documents" which means, system will pop up all inquiries, quotations, sale orders and deliveries (though you have an option to select Billing document. If at all, there is incomplete in billing document, it is only because of the preceding documents.
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