I've never used RECALL. POTA seems like a situation where it would be useful. If working a multi-op station, use RECALL and change the callsign. If working a 2-fer, RECALL and change the park.
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In the case of 2-fer , the other way to avoid LoTW rejecting the dupe is to mark one of the QSOs "QSL Sent = Y" (ie check the box), and "Conf Sent By = L". This way ACLOG won't include it in LoTW uploads.
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Is this why RECALL exists? If not, when else might it be useful?
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Thanks - Bill N7DZ?
Bill