In our landscape we have a requirement for external users e.g Supplier who will be logging onto to Supplier SAP Portal using theri email id ( exisitng userid ). They will be validated aganist a AD and from their on they would like to have a Single Sign on for all other SAP systems ( ECC , BI , etc)
But as we know SAP backend has a limitataion of number of charachetrs = 12 for a SAP logon id we will of course not be able to use the email id.
is there anyway we can map the email id to a Employee id contractor or supplierid ( 8 digit number) in the SAP backend
1. user logs onto portal using email address ( authenticat6ion happend using AD)
2. SAP logon ticket is created but email id is ampped to a 8 digit SAP userid which alreday exists in the bakcen SAP system.
Please let me know your inputs.