<summary>
Service contract for Context Handler on X509Cert binding. Used by end user system to retrieve external Reportee Element Context.
</summary><summary>
Gets the ReporteeElementContext external for a particular ReporteeElementID.
</summary>
<param name="systemUserName">
System user name is the system identifier for the Agency system as registered in Altinn - mandatory parameter
</param>
<param name="systemPassword">
System password is the password for the registered Agency system - mandatory parameter
</param>
<param name="reporteeElementID">
Reportee Element ID- The Reportee Element for which the context is expected.
</param>
<returns>
External Reportee Element Context
</returns>https://www.altinn.no/ServiceEngineExternal/ContextHandlerEC2.svc