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<?xml version="1.0" encoding="utf-8"?>
<Cancelacion xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="h
+ttp://www.w3.org/2001/XMLSchema-instance" Fecha="2017-03-13T15:56:58"
+ RfcEmisor="AAA010101AAA">
...
        </KeyInfo>
    </Signature>
</Cancelacion>

<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xm
+lns:suf="http://sufacturacion.com/" xmlns:can="http://cancelacfd.sat.
+gob.mx" xmlns:xd="http://www.w3.org/2000/09/xmldsig#">
    <soap:Header/>
...
        </suf:Cancelar>
    </soap:Body>
</soap:Envelope>

my $signed = SOAP::Data->type(string => $XML_CANCELA)->name('cancelaci
+on');
or
...
$soap->default_ns($NameSpace);
$soap->on_action(sub {qq¡"${NameSpace}Cancelar"¡});
my $response = $soap->Cancelar(($signed,$tkn));

$soap->transport->add_handler("request_send",\&pp_fixrequest);