Project Budget Integration- Question On Rollover Of Year End Left Over Budget when following Botto

Hi

I am trying to understand the functionality of Oracle Project Budget Integration with General Ledger -- Using Bottom Up Budget Integration.

On the Oracle Projects 11i Mini-pack H Documentation Supplement, page 141, under heading Year End Budget Rollover, it mention about PRC: Year End Budget Rollover Process, it mentions that this process transfer year-end balances for top-down integrated  project budgets to the next fiscal year.

Above section of the document doesn't mention about what happens to the Bottom Up Integrated budget that is left at the end of the year.

My question is what happens to, organizational level budget that is generated for Bottom Up Budget Integration. Does this not rollover to next year similar to Top Down Budget .... am I missing anything simple here ...