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Steps to create BADI and Enhancement:

  1. Go to transaction SE18 and give a BADI name ( like ZBADI_TEST  for your reference).
  2. Every BADI should be there in an enhancement spot. You can either use the existing one or create a new one. It is just a folder.
  3. After creating a BADI you can set It for single or multiple use (check flag). Define it as per requirement.
  4. Create an interface for the BADI which will have all your methods and parameters.
  5. Save the  BADI and go to transaction SE19
  6. Here you create enhancement implementation. Give a name ( as per naming convention) and then give the BADI name which you have given before.
  7. Save the enhancement implementation and then create an implementation for the interface of the BADI.  Do the coding here.
Kindly use the link http://help.sap.com/saphelp_nw04s/helpdata/en/91/f1e540f8648431e10000000a1550b0/frameset.htm
This gives you the entire detail of how to create all the above.

If any questions Please Write Good luck.

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