You can define the configuration for defaulting Seller and Buyer validation during order creation for a particular Enterprise and document type.
This validation is used to determine the Sellers and Buyers available to create an order for, and narrows the search results in the Application Consoles based on the validation type you configured.
For example, you are configuring a Hub environment with 10 Enterprises, 50 Sellers, and 100 Buyers. A particular Enterprise only interacts with 10 of the 50 Sellers and 25 of the 100 Buyers as defined in the organization hierarchy. If you set both the Seller and Buyer validations to 'Defined In The Enterprise Hierarchy', when a user creates an order the system verifies that the Seller on the order is one of the 10 Sellers defined in the Enterprise's hierarchy and the Buyer on the order is one of the 25 Buyers defined in the Enterprise's hierarchy. Also, if the user chooses the lookup for either the Seller or Buyer fields, only the Sellers and Buyers defined for the Enterprise appear in the results.