code: @Override
  	public HTTaxinvoiceJobState getJobState(String CorpNum, String JobID)
  			throws PopbillException {
  		return  getJobState(CorpNum, JobID, null);
  	}
docs: /*
  (non-Javadoc)
  @see com.popbill.api.HTTaxinvoiceService#getJobState(java.lang.String, java.lang.String)