code: private List<String> checkDeletions(List<String> deletes) {
          List<String> failedObjects = new ArrayList<String>();
          for (String delete : deletes) {
              if (!checkIfActiveOidExisting(delete)) {
                  failedObjects.add(delete);
              }
          }
          return failedObjects;
      }
docs: Checks if all oid's of the given JPAObjects are existing. Returns a list of objects where the JPAObject doesn't
  exist.