How to find a Badi for a program or TCODE

First go to any transaction->iN THE menu bar SYSTEM->STATUS->Get the program name ->double click->u will go to the program attached to the tcode. Now search term will be CALL CL_EXITHANDLER. Now u will get list of BADI'S available..
Goto SE24->Give class name as CL_EXITHANDLER->Display->double click on get_instance mathod->Now u will go inside the method->Now put break point on the cl_exithandler. Now go to any transaction code and pass dat..U will see that it will be stopped on the break point which u set on the cl_exithandler...In the exit name u can find list of badi's attached to the tcode..
There are multiple ways of searching for BADI.
Ø Finding BADI Using CL_EXITHANDLER=>GET_INSTANCE
Ø Finding BADI Using SQL Trace (TCODE-ST05).
Ø Finding BADI Using Repository Information System (TCODE- SE84).

1. Go to the Transaction, for which we want to find the BADI, take the example of Transaction VD02. Click on System->Status. Double click on the program name. Once inside the program search for ‘CL_EXITHANDLER=>GET_INSTANCE’.Make sure the radio button “In main program” is checked. A list of all the programs with call to the BADI’s will be listed.The export parameter ‘EXIT_NAME’ for the method GET_INSTANCE of class CL_EXITHANDLER will have the user exit assigned to it. The changing parameter ‘INSTANCE’ will have the interface assigned to it. Double click on the method to enter the source code.Definition of Instance would give you the Interface name.

2. Start transaction ST05 (Performance Analysis).Set flag field "Buffer trace" Remark: We need to trace also the buffer calls, because BADI database tables are buffered. (Especially view V_EXT_IMP and V_EXT_ACT)Push the button "Activate Trace". Start transaction VA02 in a new GUI session. Go back to the Performance trace session. Push the button "Deactivate Trace".Push the button "Display Trace".The popup screen "Set Restrictions for Displaying Trace" appears.Now, filter the trace on Objects: • V_EXT_IMP • V_EXT_ACT Push button "Multiple selections" button behind field Objects Fill: V_EXT_IMP and V_EXT_ACT All the interface class names of view V_EXT_IMP start with IF_EX_. This is the standard SAP prefix for BADI class interfaces. The BADI name is after the IF_EX_.So the BADI name of IF_EX_CUSTOMER_ADD_DATA is CUSTOMER_ADD_DATA

3. Go to “Maintain Transaction” (TCODE- SE93).Enter the Transaction VD02 for which you want to find BADI.Click on the Display push buttons.Get the Package Name. (Package VS in this case) Go to TCode: SE84->Enhancements->Business Add-inns->DefinitionEnter the Package Name and Execute. Here you get a list of all the Enhancement BADI’s for the given package MB. The simplese way for finding BADI is 1. chooes Tcode Program & package for that Tcode.2. Go to Tcode se18. Press F4. search by package or by program.