How to check SID of the system
Go to Admin Structure> Domains and select 'System Name' object where 'System name refer to the name of the aspect system.
Right click and open properties of the system name object. System ID can be found against the Id field in the Identification Tab.
Please check attached screenshot.
The SID shall be listed in the .SLA file (license file used inside CLS, normally there is a cache at C:\Program Files\ABB Industrial IT\ABBLicense\Licenses\Cache where you can have a look):
With access to SOFA (http://softwarefactory.abb.com, which is an internal web service available on the ABB Intranet to select license responsible persons) you can search for license certificates, dongle IDs, etc and find out the SID if you should be unable to find it in the SLA file.
Please contact your local sales representative in case you need assistance with searching in SOFA.