{
    "allOrNone": true,
    "objects": [
        {
            "query": "SELECT  Id, Pkey__c FROM Address WHERE CountryCode = 'NL' AND PKey__c != null",
            "operation": "Readonly"
        },{
            "query": "SELECT Id, Name, VisitorAdressId FROM Location WHERE VisitorAddressId = null",
            "operation": "Update",
            "beforeUpdateAddons": [
                {
                    "module": "core:RecordsTransform",
                    "description": "Updates VisitorAddressId with source Address.Id based on Pkey__c",
                    "args": {
                        "fields": [
                            {
                                "alias": "sourceAddressIdFromPkey",
                                "sourceObject": "Address",
                                "sourceField": "Id",
                                "lookupExpression": "source.PKey__c == target.Name",
                                "lookupSource": "source"
                            }
                        ],
                        "transformations": [
                            {
                                "targetObject": "Location",
                                "targetField": "VisitorAddressId",
                                "formula": "formula.sourceAddressIdFromPkey"
                            }
                        ]
                    }
                }
            ],
            "externalId": "Name"
        }
    ]
}