Hi Sumit,
so let me give you a general recommendation. When migrating (or better before), you can use the global code inspector check variant (or ABAP Test Cockpit ATC if you prefer) FUNCTIONAL_DB to check for functional regressions. Within this variant you find Robust Programming > Search DB operations in Pool/Cluster Tables.
The check will find all pool/cluster table operations in SAP delivered tables.
You may just use this single option from the CI variant to check our system, however, in order to have also the problematic operations on custom tables check or to additionally find problematic statements on transparent tables ("missing order by statement"), I recommend to use the entire "FUNCTIONAL_DB" check variant in your system.
Moreover, you might want to additionally apply the runtime monitor checks (RTM).
For more information, have a look at http://scn.sap.com/docs/DOC-47444.
Cheers,
Jasmin