SAPAbapProgramming

The message type defines the context under which an IDoc is transferred to
its destination. It allows to use the same IDoc file format to use for several
different applications.

Imagine the situation of sending a purchase order to a
supplier. When the IDoc with the purchase order reaches
the supplier, it will be interpreted as a sales order received
from a customer, namely you.
Simultaneously you want to send the IDoc data to the
suppliers warehouse to inform it, that a purchase order has
been issued and is on the way.
Both IDoc receivers will receive the same IDoc format,
however the IDoc will be tagged with a different message
type. While the IDoc to the supplier will be flagged as a
purchase order (in SAP R/3 standard: message type =
ORDERS), the same IDoc sent to the warehouse should be
flagged differently, so that the warehouse can recognize
the order as a mere informational copy and process them
differently than a true purchase order.
The message type together with the IDoc type determine
the processing function.
The message types are stored in table EDMSG.
Defining the message type can be done from the
transaction WE81.

EDMSG can be used as a check table.The entry is only a base entry which tells the system, that the
message type is allowed. Other transactions will use that
table as a check table to validate the entry.

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