4.6 ECC 6 upgrade guidelines (ABAP related)

Hi Experts,

Could someone please provide me a checklist to upgrade from 4.6 to ECC 6 from an ABAP point of view. I mean things like...

- Activating Inactive objects

- Performing Unicode & Program checks

- etc., etc.

Helpful answers will be fully rewarded.

Regards,

Karthik.