Using Dynamic Payloads for SOA Cloud ESS Job Set

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We use ESS as part of our SOA Cloud implementation. We have a case where we need to pass dynamic values for one of the field for an ESS Job that is part of a Job Set. Say Order Number is a parameter that I need to dynamically pass for the Job. In the Job Set creation, this field will be null for the Job as it can pull all orders during the schedule. The issue I see is  If I call the Job individually, it allows dynamic values but If I call the Job Set through ESS Web-Service, Even