[FX.php List] Finding several recids

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Hello, I'm traying to find several records using the recids:

$someFind->AddDBParam('-recid', '123');
$someFind->AddDBParam('-recid', '256');
$someFind->AddDBParam('-recid', '335');

But I'm only receive one record (with recid '335'). What's the correct 
code to find these records?

Thanks.

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Madrid-Spain