docs: public boolean isNull(int iAreaDesc, boolean bIncludeTempFields)
      {
          for (int i = 0; i < this.getKeyFields(false, bIncludeTempFields); i++)
          {
              if (this.getField(i) != this.getRecord().getCounterField())
                  if (this.getKeyField(i).getField(iAreaDesc).isNull())
                      return true;    // Is null
          }
          return false;   // is not null
      }