Logon with user alias w/o SAP Portal in SLC Sell Side

Hello,

After creation of contact person, a random user is generated for supplier. Using this random user, the supplier creates an user ALIAS.

In configuration guide is mentioned that is possible to logon to the sell side with user alias, but this is possible using SAP Portal with SLC. In our scenario, the SLC runs without SAP Portal, is there another way to use 'logon to sell side with user alias'?

Best Regards,

Aline