code: @Override
  	public Response registIssue(String CorpNum, Statement statement, String memo, 
  			String UserID) throws PopbillException {
  			
  		statement.setMemo(memo);
  		
  		String PostData = toJsonString(statement);
  		
  		return httppost("/Statement",
  				CorpNum, PostData, UserID, "ISSUE", Response.class);
  	}
docs: /* (non-Javadoc)
  @see com.popbill.api.StatementService#registIssue(java.lang.String, com.popbill.api.statement.Statement,
  java.lang.String, java.lang.String)