Naming Convention for Predefined Profiles
From Release 4.5A, SAP recommends you use the Profile Generator to create profiles and copy predefined user roles. Only use the profiles predefined by SAP if the documentation explicitly informs you to do so.
SAP does not guarantee that standard authorizations delivered with the R/3 System will remain the same in future releases or updates. You should therefore make your own copies of predefined profiles. Otherwise, you must check your authorizations after installing a release or update.
Naming Your Own Profiles
To avoid conflicts between profiles that you define and those supplied by SAP, you should not use any name that has an_ (underscore) character in the second position. Substitute the underscore in the second position for a different character of your choice.