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Filtering a Webhook Subscription with a UDF

I have successfully created a subscription based on AbEntry and changes to a record invoced a Webhook delivery.

I then updated the subscription with the Update endpoint to include a filter.

I have tried using "$EXISTS": "EST-WO Numbers\\Create New Estimate" but there is no Webhook delivery sent.

I changing it to "$EXISTS": "Udf/$NAME(EST-WO Numbers\\Create New Estimate)"but still no delivery.

I should include that the field is a Table UDF.

{  
    "Data": {  
        "Item": {  
            "SubscriptionId": "~",  
            "Entity": "AbEntry",  
            "Op": "Create, Update",  
            "TargetId": "~",  
            "Recipients": [],  
            "Filter": [  
                {  
                    "$EXISTS": "Udf/$NAME(EST-WO Numbers\\Create New Estimate)"  
                }  
            ]  
        }  
    }  
}