Symantec Vault permissions on SQL

I'm installing Symantec Vault and i'm aware that as part of the prerequisites it ask for the following permissions on the SQL where the ddbb of the Vault will be created:

GRANT VIEW SERVER STATE TO "domain\vsa_account"
GRANT ALTER ANY LOGIN TO "domain\vsa_account"
 

You can see here how to create the SQL login and grant the permissions:

http://www.symantec.com/business/support/index?page=content&id=HOWTO57948

 

But my problem is that i need specific documentation to justify why Symantec Vault needs such a huge permission as "ALTER ANY LOGIN". My DBA won't give me this permission just like that.

I notice that it when doing the prequisites checklist vía the Vault installer it gives a warning indicating that this role is not assigned..i assume it's not so critical because it just warns me (doesn't give an error like other points).

 

What is the impact of not having this permission assigned?. What won't work? Is there any official documentation that says why does it need this perms? (all i saw there was how to grant and howto revoke)

Tks!