Kshitij,
We just just upgraded our sandbox from ECC 6 ehp 4 to 6 and after running su25 over 900 of the proposed auth object checks where changed.
There seems to be some issues with the transaction, see note 1759777.
We have a note in to SAP to try and fix the issue, I will update this thread with the results from SAP and our analysis.
For now we are reverting back to our old customer table and allowing the functional team to test as break fixing new objects will likely be allot less work than updating su24 with 900 values and yes these are all transactions that are currently assigned and being used.
Regards,
Curtis