private List<ValidationError> checkForNoRatesPresent(){
  if (overheadRates != null && overheadRates.isEmpty())   return Arrays.asList(new ValidationError("overheadrate","estimate.overhead.altleastone_overheadrate_needed"));
 else   return null;
}

private List < ValidationError > checkForNoRatesPresent ( ) { if ( overheadRates != null && overheadRates . isEmpty ( ) ) return Arrays . asList ( new ValidationError ( "overheadrate" , "estimate.overhead.altleastone_overheadrate_needed" ) ) ; else return null ; }
this method checks if no overhead rates have been entered for the overhead .
