Domain ID for Project Server Belongs too?

[TEC]

Correct me if I am wrong,But I think someone hasd changed something in my
database. In the project server database. The domain account that PS is using
should it be:

The DBO for Project Server database and belong to the MSPROJECTUSER ROLE and
MSPROJECTSERVERUSER role. Or no DBO just the 2 roles.

 

[TEC]

Within my Project Server database the domain ID for PS is the DBO so it will
not let me add this ID to the msprojectuser and msprojectserveruser roles
When I try to also add it to these two roles I get the error message "Cannot
use the reserved user or role name 'dbo. Is this a problem or can I just
leave it as the DBO since DBO has all rights to a database.