...
In order for the communications equipment to communicate with the system, a user with certain permissions must be provided from SAP:
Rol → SAP_XI_APPL_SERV_USER
Role Z created by us which has the authorisation object S_SERVICE with the permissions of the three Service Definitions.
Authorisation object S_SERVICE:
Serv. Type: WS
External Service: /EINVO/RO_SD_SEND_RESPONSE//EINVO/RO_SD_SEND_RESPONSE (Service Definition Name + / + Service Definition Function Module)
...