$sSQL = qq{ ... WHERE SAPP = ? AND SOWNERID = ? ... };
...
$sCursor->execute($gsApp, $sOwnerID);

##</code><code>##

$sSQL = qq{ ... WHERE (SAPP = ? OR (? is NULL AND SAPP is NULL)) AND ... };
...
$sCursor->execute($gsApp, $gsApp, $sOwnerID, $sOwnerID);