The Service Identifier/External Identifier is the business system application ID in an ABAP system,
It is maintained in provider system and used in consumer system.
In consumer system, when create a “System Connection” to provider system, it may popups a dialog to ask the “External Application Key” and user account, like this:
So we need to know how to find this Key in Provider system.
As of SP22 of SAP NetWeaver 7.00, it could be found in SOAMANAGER:
-> Global System Settings -> Service Identifier (tab):
Then after release 7.30, the path changed to:
-> Technical Administration tab -> SAP Client Settings:
Others, if you are in old release (before 7.00 SP22) or you could not find it, like this:
Then you can use such URL to get the value directly:
It will show such page:
(Here the EXTERNAL_ID node is what we needed.)