Structure of Message Determination 
Purpose
This process describes how the message determination is carried out in the case of a summarized JIT call. The system always accesses message determination when you create a new JIT call.
Prerequisites
In the SAP standard system, Customizing is already set for the message determination. However, you can carry out extensions in the customer name period. For the message determination the following are necessary:
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Condition table-
Access sequence-
Message type-
Message determination schema-
Partner function
Condition records are not provided in the SAP standard system; you have to fill out the condition tables yourself.
For detailed information on message determination see
Message Determination ff.Process flow
The Customizing settings for message determination schema, partner function and message type determine which messages have been permitted and which partner functions can be used with these message types.
In searching for suitable condition records, the message determination covers the tables in the message determination schema, partner functions and message types.
By means of the partner function in the JIT call profile, the system can find the message partner, to whom the message is to be transmitted, with the vendor master record. The vendor, who is maintained in the corresponding scheduling agreement with this partner function, is transferred into the JIT call as message partner.
Example for Message Determination Structure