Hi Liju,
There are two types of program checks - static check(when the program is created) and dynamic check(when you run the program).
The static check is again of two types - syntax check and epc (Extended program check)
The system checks ABAP programs statically when you create them and dynamically when they are running.
The syntax check tests the syntax of the program and internal semantics of a program. This what we usually use when we create the program using CNTL+F2.
The extended program check performs a semantic check (including, for example, checking whether the number and type of the interface parameters in an external procedure call is correct).
Many checks are excluded from the standard syntax check for performance reasons. The extended program check performs a complete check that includes the interfaces of external procedures called from your program.
Errors in the extended program check cause exceptions, which in turn cause runtime errors when you run the program. You must correct them. The exception to this is coding that cannot be reached. However, you should delete this to minimize the size of your program and make the source code easier to understand.
Warnings in the extended program check should also be corrected. If your program contains statements that are definitely correct but still produce warnings in the extended program check, you can exclude them from the check using pseudocomments ( "#EC… ).
You should always run the extended program check on a new program. You have not finished developing a new program until you can run the extended program check on it without any errors or warnings. Messages are permissible, since they are generally not critical.
The extended program check is also only a static check. It cannot eliminate all of the circumstances that could lead to exception situations or runtime errors. For example, any statements in which you specify arguments dynamically as the contents of fields, or in which you call procedures dynamically, cannot be checked statically.
Hope that was useful.
Cheers,
Susmitha
Bluesky
