In my fairly experienced view...
The first rules of running larger SAP and EBS integration programmes and projects is always :
1. Front load and finance the programme with a proper requirements and transition mapping stage.
2. Do not allow any SI to write those requirements on your behalf.
3. Don't give the contract to IBM or WIPRO.
4. Or Accenture.
5. Or, err... CSC.
Okay, so that's five rules... and I'm available at short notice if you need me at an almost reasonable day rate.