Answer Posted / vijay vasant wani

Making enhancements using the transactions SMOD/CMOD has
the following disadvantages:

1) This enhancement technique assumes a two-tiered system
infrastructure (SAP – customers).

2) The naming conventions in effect do not tolerate name
extension.

3) It can be called only once. i.e. A user exit can not be
assigned to more than one project.

Adavantages of BAdI
1) Fulfills the requirements of a system infrastructure
containing country versions, industry solutions, partners,
and customers.
2) Business Add-Ins should be considered generalized
Business Transaction Events that can be used to bundle
program, menu and screen enhancements into a single add-in.
3) Business Add-Ins can be created and employed in each of
the various software levels.
4) BAdI can be called namy times. i.e. BAdI implementation
can be assigned to more definations.

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