How to Use Request Transformation Option for ADP

Summary:

We are using Combo box to Store the LOV Values of Employee Number.

This Employe Number is based on Variable SelectEmployeeNumber

The Table Data is based on ADP

requesttransformationoption below is not working

"criteria": [

 {

  "op": "$eq",

  "attribute": "EMPLOYEE_NNUMBER",

  "value": "{{ $variables.SelectedEmployeeNumber }}"

 }

How to us the Filter Criteria in ADP for the above .

Please advise

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