forwardedFrom

The original demand this one was forwarded from, if any. Set by ksl.modeling.supplychain.flow.DemandForwarder and routing nodes (cross-docks) that forward a request upstream: the forwarder sends a forwarded request upstream while parking the original in IN_PROCESS; when the forwarded request returns delivered, the receiving endpoint reads this property to recover the typed original and fill it.

Typed alternative to stashing the original on QObject.attachedObject, which is Any? and required a runtime cast at every receive site.