Check Modules 

Definition

When maintaining an external command, you can specify the name of a check module. A check module is a function module that is executed immediately before the command, and can decide whether the command will be executed or not.

Your system already contains the prototype of such a check module:

SXPG_DUMMY_COMMAND_CHECK

The check module contains an ABAP comment with an example of how it is used.

Do not change the check module SXPG_DUMMY_COMMAND_CHECK, but instead work with a copy. You can freely define the name of the check module. Only the interface has to be the same as for the check module SXPG_DUMMY_COMMAND_CHECK. The check module can only stop the execution of the command by triggering the exception NO_PERMISSION.

See also:

Processing Illegal Changes to External Commands

Syslog Trace and System Alert Monitor