estou usando Schema v03, e não consigo cancelar...veja xml de retorno...
<?xml version="1.0" encoding="UTF-8" standalone="true"?>
-<ns5:CancelarNfseResposta xmlns:ns6="http://www.ginfes.com.br/servico_cancelar_nfse_envio" xmlns:ns5="http://www.ginfes.com.br/servico_cancelar_nfse_resposta" xmlns:ns3="http://www.ginfes.com.br/tipos" xmlns:ns4="http://www.ginfes.com.br/servico_consultar_nfse_envio" xmlns:ns2="http://www.w3.org/2000/09/xmldsig#">
<ns5:Sucesso>false</ns5:Sucesso>
<ns5:DataHora>2014-05-09T10:58:25</ns5:DataHora>
-<ns5:MensagemRetorno>
<ns3:Codigo>E303</ns3:Codigo>
<ns3:Mensagem>O documento XML difere da assinatura.</ns3:Mensagem>
<ns3:Correcao>O documento XML nao pode conter alteracoes apos a assinatura.</ns3:Correcao>
</ns5:MensagemRetorno>
</ns5:CancelarNfseResposta>
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