if ($UserString) {
$Users = RT::Users->new($session{'CurrentUser'});
$Users->Limit(FIELD => $UserField, VALUE => $UserString, OPERATOR => $UserOp);
if ($UserString) {
$Users = RT::Users->new($session{'CurrentUser'});
$Users->Limit(FIELD => $UserField, VALUE => $UserString, OPERATOR => $UserOp);