For the Single Activity Trace an SAP Passport has to be issued by the connectivity layer of the library.
The SAP Passport is transported as an HTTP header in the request. The server handles the SAP Passport to generate end-to-end Trace. The OData SDK is using JSDR SAP Passport sources integrated in the library at source level. It can be turned on or off with ISDMPreferences.SDM_TRACING_ENABLED preference key. By default it is turned off.