How to restrict customers to create the sales orders using their source reference value extension

Hi Team,

There is a requirement for our client, to restrict the sales order creation based on the customer source reference value. So, we have the customers from different source systems, for our value chain we should enable to allow only one source system value customers based on the order type through the extension.

The standard field for source system is not available in the oracle documents, raised on oracle SR and suggested to ask a question here, can any one please help us to restrict the customers to create the sales orders using Extensions?