code: private boolean updateLinkRemoveValues() {
          Set<String> removeSet = m_dbObj.getRemoveValues(m_fieldName);
          List<String> addSet = m_dbObj.getFieldValues(m_fieldName);
          if (removeSet != null && addSet != null) {
              removeSet.removeAll(addSet);    // add+remove of same ID negates the remove
          }
          if (removeSet == null || removeSet.size() == 0) {
              return false;
          }
          
          for (String removeObjID : removeSet) {
              deleteLinkValue(removeObjID);
          }
          return true;
      }
docs: Process removes for our link. Return true if at least one update made.