Answer / upamanyu

USER EXITS:
-----------
User Exits are not specific to MM, but a feature of SAP to
introduce new features in an existing functionality. For
example, while saving a PO, if there are specific business
requirement (like displaying custome messages like etc)
then special ABAP programs called 'USER EXITS' can be
introduced into the functionality.

To Summarize - USER EXITS are ABAP programs which are
coded to introduce customer-required functionalities in SAP
which may not be present in standard SAP.


MESSAGE OUTPUT DETERMINATION
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Considering only MM, lets say the user creates a PO and
saves it. Once the PO is approved, it should get
transmitted to the vendor through some medium like FAX,
EDI, Email, or maybe even a printout through a printer
nearby. Now, the strategy which determines how the PO
should get transmitted to the vendor is called the Message
Output determination. So if the strategy is determined so
that the PO, after saving, gets sent to the vendor as an
email, then everytime the user creates the PO and saves it,
an email containing the PO information in a particular
format (which can also be specified through smartforms
etc), will be sent to the vendor id.


NOTE - Message Output determination can be set for not only
PO, but for all purchase documents like PO, RFQ etc.

Answer / mmuser

Both are generic questions.
user exists: it is piece of program to do some activities,
user exits will be used in different transactions.

message out determination: message out determination is the
condition, upon satisfaction of condition respected message
out will be triggered examples are :print of purchase order,
ale trigger, material document printout upon goods receipt etc.

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