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BPWarningDisplayMethodUpdateUnpredictable: The display method in Form may not update as expected

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Posted on by CU22120935-0

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Hi,

I got this BP warning:
BPWarningDisplayMethodUpdateUnpredictable: The display method 'test' in form '$testForm' may not update as expected

i'm getting the BP warning on the 2 display methods test() and test1()

[Form]
public class TestForm extends FormRun
{
    ClassTestContract   classTest;
    

    /// <summary>
    /// init
    /// </summary>
    public void init()
    {
        classAContract classA;

        super();

        classA = element.args().parmobject() as classAContract;

        classTest = classA.parmClassTestContract();
    }

    public display boolean test()
    {
      return classTest.parmX().parmY()? true : false;
    }

    public display boolean test1()
    {
        return classTest.parmZ().parmY();
    }

}

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André Arnaud de Cal... 306,686 Super User 2026 Season 2 on at

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Hi,

You get this warning in case the display methods are created on the form instead of a form data source. In case the information is retrieved only once when opening the form, you can better use unbound controls and fill the values by setting a value for these controls.

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CU22120935-0 252 on at

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Hi Andre,

do you mean to set the value of the unbound control in the init method of the form??

and normally if there is a display method, then it should be put in the form datasource instead of form?

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Martin Dráb 240,281 Most Valuable Professional on at

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The warning tells you that you may expect display values being updated when parmX(), parmY() or parmZ() starts returning a different value, but it won't happen, because you haven't implemented such a logic. The values will be obtained just once. The system can't say whether it's the behaviour you want or not.

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