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Reset or Clear Dropdown Selected In PowerApps(SharePoint Dropdown)



I'm trying to customize form in PowerApps.

I have two Choice columns in SP which is Incident Category 1 & Incident Category 2(SharePoint Dropdown),these are cascading dropdowns and its getting data from another list which is 'Single line of text' columns.


I wants to reset Incident Category 2 on change of Incident Category 1. Here is the problem I tried with all the possibilities but it's just not happening.


When I give nothing in 'DefaultSelectedItems', its working. But when I try to edit item selected value will not reflect.


Please help me with this


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