docs: public int setString( String strField, boolean bDisplayOption, int iMoveMode)
      {
          NumberField numberField = (NumberField)this.getNextConverter();
          int iErrorCode = super.setString(strField, DBConstants.DONT_DISPLAY, iMoveMode);
          if (strField.length() == 0)
              numberField.displayField();     // Special Case (because we return immediately)
          if ((iErrorCode != DBConstants.NORMAL_RETURN) || strField.length() == 0)
              return iErrorCode;
          double doubleValue = this.getValue();
          if (doubleValue != 0)
              doubleValue = 1 / doubleValue;
          iErrorCode = this.setValue(doubleValue, bDisplayOption, DBConstants.SCREEN_MOVE);
          return iErrorCode;
      }