Retail Pro 9 Invoice.xml minimal structure

update-comments-invoice.xml

<?xml version="1.0" encoding="utf-8"?>
<DOCUMENT>
	<INVOICES>
		<INVOICE invc_sid="123456789012345678" sbs_no="2" invc_type="0">
			<INVC_COMMENTS>
				<INVC_COMMENT comment_no="1" comments="Test comment" />
			</INVC_COMMENTS>
		</INVOICE>
	</INVOICES>
</DOCUMENT>

update-item-note-invoice.xml

<?xml version="1.0" encoding="utf-8"?>
<DOCUMENT>
	<INVOICES>
		<INVOICE invc_sid="12345678912345678" sbs_no="1" invc_type="0">
			<INVC_ITEMS>
				<INVC_ITEM item_pos="1" item_sid="123456781234567" item_note1="Test Note 1" />
			</INVC_ITEMS>
		</INVOICE>
	</INVOICES>
</DOCUMENT>