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<?xml version="1.0" encoding="UTF-8"?>
<myxml>
    ...
    <conceptid></conceptid>
</myxml>

conceptid Mandatory
Unique identifier for the concept invoice.

<?xml version="1.0" encoding="UTF-8"?>
    <response>
        <concept>
            <conceptid></conceptid>
            <entryid></entryid>
        </concept>
    </response>

conceptid
Unique identifier for the concept invoice.

entryid
Entryid when available. May show multiple entryid's when concept is used to convert to invoice multiple times.