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Partner Functions 
The function Partner Determination in Trading Contract enables you to display the partners involved in a trading business transaction, their functions and their business relationships in the SAP system, for both sales and purchasing. When creating or processing a trading contract, the system automatically determines the partners from the master data.
A partner determination procedure is defined to identify which partner functions are involved in a business transaction. The partner determination procedure is assigned at both the header and the item level of the contract. Partners defined in a trading contract are automatically transferred to follow-on documents such as the sales order and the purchase order.

This function is the same as the one in the Sales and Distribution module. Depending on contract characteristics, you create the partner determination procedure for only customer related data, vendor related data or for both types of data jointly.
For more
information on the Partner Determination Process, see
Partners in the Sales
and Distribution Process
