dump in ALV-control when displaying a WebService

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Symptom
In SE80, when displaying a service definition based on a function module, function group or BAPI, the “external” or “internal” view shows an error within the ALV-Control: “Node already exists”
Other terms
service definition dump ALV
Reason and Prerequisites
The reason for this problem is that under certain circumstances, the external or internal view tree generates doublicate [...]