Program: 58651
Project: 58651
Buggy source:
public BigDecimal computeKilometricExpense(ExpenseLine expenseLine,Employee employee) throws AxelorException {
  BigDecimal multiplier=expenseLine.getKilometricTypeSelect() == 1 ? BigDecimal.ONE : new BigDecimal("String_Node_Str");
  BigDecimal distance=expenseLine.getDistance().multiply(multiplier);
  BigDecimal previousDistance;
  KilometricLog log=Beans.get(KilometricService.class).getKilometricLog(employee,expenseLine.getExpenseDate());
  if (log == null) {
    previousDistance=new BigDecimal("String_Node_Str");
  }
 else {
    previousDistance=log.getDistanceTravelled();
  }
  KilometricAllowanceRate allowance=Beans.get(KilometricAllowanceRateRepository.class).all().filter("String_Node_Str",expenseLine.getKilometricAllowParam()).fetchOne();
  List<KilometricAllowanceRule> ruleList=new ArrayList();
  for (  KilometricAllowanceRule rule : allowance.getKilometricAllowanceRuleList()) {
    if (rule.getMinimumCondition().compareTo(previousDistance.add(distance)) == -1 && rule.getMaximumCondition().compareTo(previousDistance) == 1) {
      ruleList.add(rule);
    }
  }
  if (ruleList.size() == 0) {
    throw new AxelorException(I18n.get(String.format(IExceptionMessage.KILOMETRIC_ALLOWANCE_NO_RULE,allowance.getKilometricAllowParam().getName())),IException.CONFIGURATION_ERROR);
  }
  BigDecimal price=BigDecimal.ZERO;
  if (ruleList.size() == 1) {
    price=distance.multiply(ruleList.get(0).getRate());
  }
 else   if (ruleList.size() > 0) {
    Collections.sort(ruleList,new Comparator<KilometricAllowanceRule>(){
      @Override public int compare(      final KilometricAllowanceRule object1,      final KilometricAllowanceRule object2){
        return object1.getMinimumCondition().compareTo(object2.getMinimumCondition());
      }
    }
);
    for (    KilometricAllowanceRule rule : ruleList) {
      BigDecimal min=rule.getMinimumCondition().max(previousDistance);
      BigDecimal max=rule.getMaximumCondition().min(previousDistance.add(distance));
      price=price.add(max.subtract(min).multiply(rule.getRate()));
    }
  }
  return price.setScale(generalService.getNbDecimalDigitForUnitPrice(),RoundingMode.HALF_UP);
}

Fixed version (ground truth):
public BigDecimal computeKilometricExpense(ExpenseLine expenseLine,Employee employee) throws AxelorException {
  BigDecimal multiplier=expenseLine.getKilometricTypeSelect() == 1 ? BigDecimal.ONE : new BigDecimal("String_Node_Str");
  BigDecimal distance=expenseLine.getDistance().multiply(multiplier);
  BigDecimal previousDistance;
  KilometricLog log=Beans.get(KilometricService.class).getKilometricLog(employee,expenseLine.getExpenseDate());
  if (log == null) {
    previousDistance=new BigDecimal("String_Node_Str");
  }
 else {
    previousDistance=log.getDistanceTravelled();
  }
  KilometricAllowanceRate allowance=Beans.get(KilometricAllowanceRateRepository.class).all().filter("String_Node_Str",expenseLine.getKilometricAllowParam()).fetchOne();
  List<KilometricAllowanceRule> ruleList=new ArrayList();
  for (  KilometricAllowanceRule rule : allowance.getKilometricAllowanceRuleList()) {
    if (rule.getMinimumCondition().compareTo(previousDistance.add(distance)) <= 0 && rule.getMaximumCondition().compareTo(previousDistance) >= 0) {
      ruleList.add(rule);
    }
  }
  if (ruleList.size() == 0) {
    throw new AxelorException(I18n.get(String.format(IExceptionMessage.KILOMETRIC_ALLOWANCE_NO_RULE,allowance.getKilometricAllowParam().getName())),IException.CONFIGURATION_ERROR);
  }
  BigDecimal price=BigDecimal.ZERO;
  if (ruleList.size() == 1) {
    price=distance.multiply(ruleList.get(0).getRate());
  }
 else   if (ruleList.size() > 0) {
    Collections.sort(ruleList,new Comparator<KilometricAllowanceRule>(){
      @Override public int compare(      final KilometricAllowanceRule object1,      final KilometricAllowanceRule object2){
        return object1.getMinimumCondition().compareTo(object2.getMinimumCondition());
      }
    }
);
    for (    KilometricAllowanceRule rule : ruleList) {
      BigDecimal min=rule.getMinimumCondition().max(previousDistance);
      BigDecimal max=rule.getMaximumCondition().min(previousDistance.add(distance));
      price=price.add(max.subtract(min).multiply(rule.getRate()));
    }
  }
  return price.setScale(generalService.getNbDecimalDigitForUnitPrice(),RoundingMode.HALF_UP);
}