In your FES system, the following system alias are defined: The following screenshot shows the definition of OData service ZMM_PUR_PR_PROCESS_SRV: Your user is assigned to user roles ZS4SIA and ZS4EUR in the FES system. You are executing the following URI request in the gateway client of the FES system :/sap/opu/odata/sap/ZMM_PUR_PR_PROCESS_SRV:mo/<0Data-request> From which BES system will the data come from?