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how to empty lov, using lov switcher cascade

AmirElsaeedJan 18 2023

Hello,
I am trying to create 2 LOVs at attribute like below image using switcher
Screenshot_3.pngand on switcher attribute i added below expression
filterOptionDatatype == 'VARCHAR' ? 'LOV_RelationalOperatorForVARCHAR' : filterOptionDatatype == 'NUMBER' ? 'LOV_RelationalOperator' : null
it filters well and switch between 2 LOVs without problem
my problem is,
when I run the page, it fetch LOV based on default one
how to make it empty on first run?
I am using JDeveloper 12.2.1.4

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Added on Jan 18 2023
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