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Changing the pop-up validation message on a picker control:
Before You Begin
If we are using the Picker Control, we unfortunately can't modify the pop-up message. You can log a feature request on https://ideas.k2.com/
1. Add a data label on the form or view, and then check the 'Literal' option
2. Add an expression to the new control as below:
$(".wrapper").attr("data-searchmodalerrorselectavalue","This is my custom massage");