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Hi 

We are using TMF 641 from Service Ordering 

We have a scenario where we are replacing one service (service A) with another service ( service B)

Once Service A (Gaining service) has been completed , Service B ( losing Service) need to be Ceased which already part of service inventory 

Service A have multiple service order items ( relationship defined with ServiceOrderItemRelationship )

While placing the gaining service order I am want to pass losing service inventory reference in my order 

I found  below reference 

serviceRelationship A list of service relationships (ServiceRelationship [*]). A list of service relationships 
(ServiceRelationship [*]). Describes links with other service(s) in the inventory.

But not sure how to use . can anyone provide me json with some justification 

Thanks