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Arthur WangUser Exits:
1. What are different types of user exits?
Function exit, Menu exit, Screen Exit and Field exit
2. How does field exit work and what is it ? If define a field exit then what are the implications?
Exit is add-on hook to standard program. This exit is not comes under the program, but while executing the program, the exit will be added to main program.
Field exit will work for all the transactions where the data element of the field used.
3. What is the concept behind there user exits?
If you modify any standard program, it leads two problems.
1. Integration of SAP will be effected.
2. Upgrading SAP will overwrite the modifications.
Or upgrading will be difficult. User Exit will overcome these problems.