I solved a similar problem using this javascript:
require([
'splunkjs/ready!',
'splunkjs/mvc/textinputview',
'splunkjs/mvc/dropdownview'
],
function(mvc) {
var input1 = mvc.Components.get('input1');
var input2 = mvc.Components.get('input2');
input1.on('change', function() {
input2.val(undefined);
});
});
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