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Definition of BAdIs in the Enhancement
Builder 
The BAdIs of the enhancement concept are not treated as standalone objects, but are integrated in the overall concept. Thus, the tools for defining BAdIs are part of the Enhancement Builder included in the ABAP Workbench.
Transaction SE18, up to now the only entry point for defining classic BAdIs, now manages classic and new BAdIs. When an existing BAdI is displayed or changed, it analyzes whether the BAdI is a classic or a new one, and then switches to the respective tool. In the case of a new BAdI, this tool is the enhancement spot editor.

Creating classic BAdIs is no longer supported.
Since the classic SE18 transaction represents only a side entry point into the Enhancement Builder, the sections below describe the procedure in the Object Navigator:
· Displaying, Changing, or Deleting a BAdI