Recently I got a job as ABAP/4 programmer. I don't know about User exits. Can you please help tell me about User Exits and how can I learn User Exits fast!
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User exits are hooks in standard SAP code, which allow you to add
functionality. The positioning of these exits has been defined by SAP, so
often you can't find one where you need it!
The implementation of user exits depends on the module. Some (and more, as
you go to later releases) are implemented using CALL CUSTOMER-FUNCTION (see
help documentation for this ABAP statement) - these are controlled from
transactions CMOD and SMOD - have a look at the online documentation -
transaction CMOD, menu Utilities --> Online Manual.
In older areas of SAP code, the exit might be coded using an empty form
supplied by SAP. E.g. look at module SAPMV45A. This has many forms
beginning USEREXIT_... You can insert your own code in this.
In other areas such as FI or LIS, there are configuration entries which
allow calls to external ABAP code.
Up until 4.5, there are field-exits. These are triggered as the first
action during a PAI event. They are linked to a field's domain, and can be
made global for that domain, or screen specific.
Finally, you may need to make customer specific changes to SAP code. Note
that if you choose to do this, SAP will not support the modified code.
This was first published in September 2001
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