protected List<String> collectAffectedSentries(CmmnExecution child, String transition) {
    List<? extends CmmnSentryPart> sentryParts = getCaseSentryParts();

    List<String> affectedSentries = new ArrayList<String>();

    for (CmmnSentryPart sentryPart : sentryParts) {

      // necessary for backward compatibility
      String sourceCaseExecutionId = sentryPart.getSourceCaseExecutionId();
      String sourceRef = sentryPart.getSource();
      if (child.getActivityId().equals(sourceRef) || child.getId().equals(sourceCaseExecutionId)) {

        String standardEvent = sentryPart.getStandardEvent();
        if (transition.equals(standardEvent)) {
          addIdIfNotSatisfied(affectedSentries, sentryPart);
        }
      }
    }

    return affectedSentries;
  }