Account Dimension - Net Income

I have created a cube for Financial reporting using the AdventureWorks 2008R2 DW as a guide. I've defined my GL accounts and created the account hierarchy and everything is rolling up the way I expect with the exception of Net Income. It calculated correctly but the Balance sheet is not at zero but shows an amount equal to income. My question is should Income roll up under the Owner's Equity through the dimension or is there a way in SSAS to populated Retained Earnings? In the MS example, Income does not roll up anywhere but is at the same level as the Balance Sheet. I am completely confused on a best practice for handling this.