ID User name when provisioning new user account in R/3 System with CUP

Hi,

Is it possible to configure somehow a rule in CUP for ID user names to be created in the backend system when direct auto provisioning is done?

Example: User_A creates a request for a new account in System SAP S1.

Such user will be created in S1 under ID "XXXX_User_A"

Many thanks in advance. Best regards,

Imanol