Custodian Manager - ImportExport.exe - Is the SID attribute required?

Hi All,

I'm trying to load employees into Custodian Manager using an xml file and the ImportExport utility. After I've running an export following an import of new custodians, I noticed that an SID is not automatically assigned for the Custodian entries.

Is SID the primary key for Custodian entries? And will there be any issues if I don't set an SID during the import?

Many thanks in advance!