code: @Override
  	public Response registIssue(String CorpNum, Statement statement) throws PopbillException{
  		return registIssue(CorpNum, statement, null);
  	}
docs: /* (non-Javadoc)
  @see com.popbill.api.StatementService#registIssue(java.lang.String, com.popbill.api.statement.Statement)