Hello Johannes,

Thank you for your post. I have been looking into your issue and it seems that it occurs because you are setting the formula which contains objects before to be initialized. In your second scenario the editors that you refer in the formula are created before that and everything goes right. To achieve the desired behavior in the first scenario you can handle the ‘ValueChanged’ event of the editor with id “Weight” and put the formulas in its body like e.g. :

  private void XamNumericEditor_ValueChanged(object sender, System.Windows.RoutedPropertyChangedEventArgs<object> e)

        {

            ControlCalculationSettings calcSettings1 = new ControlCalculationSettings();

            calcSettings1.Formula = "0.007184 * power([//Height], 0.725) * power([//Weight], 0.425)";

            XamCalculationManager.SetControlSettings(xneResult2, calcSettings1);

            XamCalculationManager.SetCalculationManager(xneResult2, CalculationManager);

            ControlCalculationSettings calcSettings2 = new ControlCalculationSettings();

            calcSettings2.Formula = "10000 * [//Weight] / [//Height] / [//Height]";

            XamCalculationManager.SetControlSettings(xneResult1, calcSettings2);

            XamCalculationManager.SetCalculationManager(xneResult1, CalculationManager);

        }

Let me know, if you need any further assistance on this matter.