code: @Override
  	public Response issue(String CorpNum, int ItemCode, String MgtKey,
  			String Memo) throws PopbillException {
  		return issue(CorpNum, ItemCode, MgtKey, Memo, null, null); 
  	}
docs: /* (non-Javadoc)
  @see com.popbill.api.StatementService#issue(java.lang.String, java.number.Integer, java.lang.String, java.lang.String)