Hi Manuel,
In the tab "Operation Determination" of REST sender communication channel configuration, fields "Operation" and "Namespace" shall refer to message type name (of a request message type in a respective called service interface operation) and its namespace, correspondingly, and not a service interface name (service operation is determined by a request message type later on by runtime). In your case, value for the field "Operation" shall be MT_RiesgosConsultablesIdReq.
Regards,
Vadim