Hi All,
This document is related to how to find Substitution Transaction Codes.
Problem behind:We are all aware that SAP has been updating many programs and transaction codes in every new version it releases. Sometimes the program is modified to add more functionality and sometimes a new transaction code is provided with more features when compared to the old one (For e.g., SAP EnjoyTransactions). In such cases, there is a possibility that the old transaction code is made obsolete and the users should be using the new transaction created for the same. How to know the new transaction created by SAP for a particular transaction code?
Solution: Refer Database table PRGN_CORR2 to find the new transaction codes.
Example : In some cases. you need to write a Simple BDC for data uploading to a Enjoy Transaction. But as you aware of, In Enjoy Transactions Dynpro is not captured(Most of the cases) because of the Custom Containers in the Screens. So in this case you can find the alternate way for uploading data is through the Substitution transaction. You can search for the substitution transaction as mentioned below.
1. Goto SE11 and open the Table PRGN_CORR2.
2. Enter the Transaction code which you want to search a Substitution(Enjoy Transaction).
3. Vice Versa, You know the Enjoy Transaction, But you want to search for a Old Transaction
I Hope this Document will be helpful for everyone who does ABAP. Keep R&Ding 
Thanks & Regards,
Venkat Sesha