Program: 171899
Project: 171899
Buggy source:
@Override public ReactionToIncomingMessage processIncomingMessage(Object message){
  if (isIncomingMessageValid(message,ChargingStatusReqType.class,chargingStatusRes)) {
    chargingStatusRes.setEVSEID(getCommSessionContext().getACEvseController().getEvseID());
    chargingStatusRes.setSAScheduleTupleID(getCommSessionContext().getChosenSAScheduleTuple());
    chargingStatusRes.setACEVSEStatus(getCommSessionContext().getACEvseController().getACEVSEStatus(EVSENotificationType.NONE));
    if (getCommSessionContext().getSelectedPaymentOption().equals(PaymentOptionType.EXTERNAL_PAYMENT)) {
      chargingStatusRes.setReceiptRequired(false);
    }
 else {
      chargingStatusRes.setReceiptRequired(false);
    }
    MeterInfoType meterInfo=getCommSessionContext().getACEvseController().getMeterInfo();
    chargingStatusRes.setMeterInfo(meterInfo);
    getCommSessionContext().setSentMeterInfo(meterInfo);
    if (chargingStatusRes.isReceiptRequired()) {
      return getSendMessage(chargingStatusRes,V2GMessages.METERING_RECEIPT_REQ);
    }
 else {
      ((ForkState)getCommSessionContext().getStates().get(V2GMessages.FORK)).getAllowedRequests().add(V2GMessages.CHARGING_STATUS_REQ);
      ((ForkState)getCommSessionContext().getStates().get(V2GMessages.FORK)).getAllowedRequests().add(V2GMessages.POWER_DELIVERY_REQ);
      return getSendMessage(chargingStatusRes,V2GMessages.FORK);
    }
  }
 else {
    if (chargingStatusRes.getResponseCode().equals(ResponseCodeType.FAILED_SEQUENCE_ERROR)) {
      BodyBaseType responseMessage=getSequenceErrorResMessage(new ChargingStatusResType(),message);
      return getSendMessage(responseMessage,V2GMessages.NONE,chargingStatusRes.getResponseCode());
    }
 else {
      setMandatoryFieldsForFailedRes(chargingStatusRes,chargingStatusRes.getResponseCode());
    }
  }
  return getSendMessage(chargingStatusRes,V2GMessages.NONE,chargingStatusRes.getResponseCode());
}

Fixed version (ground truth):
@Override public ReactionToIncomingMessage processIncomingMessage(Object message){
  if (isIncomingMessageValid(message,ChargingStatusReqType.class,chargingStatusRes)) {
    chargingStatusRes.setEVSEID(getCommSessionContext().getACEvseController().getEvseID());
    chargingStatusRes.setSAScheduleTupleID(getCommSessionContext().getChosenSAScheduleTuple());
    chargingStatusRes.setACEVSEStatus(getCommSessionContext().getACEvseController().getACEVSEStatus(EVSENotificationType.NONE));
    if (getCommSessionContext().getSelectedPaymentOption().equals(PaymentOptionType.EXTERNAL_PAYMENT)) {
      chargingStatusRes.setReceiptRequired(false);
    }
 else {
      chargingStatusRes.setReceiptRequired(true);
    }
    MeterInfoType meterInfo=getCommSessionContext().getACEvseController().getMeterInfo();
    chargingStatusRes.setMeterInfo(meterInfo);
    getCommSessionContext().setSentMeterInfo(meterInfo);
    if (chargingStatusRes.isReceiptRequired()) {
      return getSendMessage(chargingStatusRes,V2GMessages.METERING_RECEIPT_REQ);
    }
 else {
      ((ForkState)getCommSessionContext().getStates().get(V2GMessages.FORK)).getAllowedRequests().add(V2GMessages.CHARGING_STATUS_REQ);
      ((ForkState)getCommSessionContext().getStates().get(V2GMessages.FORK)).getAllowedRequests().add(V2GMessages.POWER_DELIVERY_REQ);
      return getSendMessage(chargingStatusRes,V2GMessages.FORK);
    }
  }
 else {
    if (chargingStatusRes.getResponseCode().equals(ResponseCodeType.FAILED_SEQUENCE_ERROR)) {
      BodyBaseType responseMessage=getSequenceErrorResMessage(new ChargingStatusResType(),message);
      return getSendMessage(responseMessage,V2GMessages.NONE,chargingStatusRes.getResponseCode());
    }
 else {
      setMandatoryFieldsForFailedRes(chargingStatusRes,chargingStatusRes.getResponseCode());
    }
  }
  return getSendMessage(chargingStatusRes,V2GMessages.NONE,chargingStatusRes.getResponseCode());
}