code: public void clearTemporaryKeyField()
      {
          Record record = this.getOwner();
          KeyArea keyArea = record.getKeyArea(0);
          if (keyArea.getKeyFields(false, true) == 2)
              if (m_fakeKeyField != null) // Always
                  keyArea.removeKeyField(m_fakeKeyField);
      }
docs: Remove the temporary key field.