Deep Entity and create entity

Hello Everyone,

For creating SalesOrder/Purchase Order  we generally need to implement deep entity functionality .

Suppose let's say if we written something in create entity method for Salesorder Header set What will be the consequences ?

Understand that it's seems to be a illogical question , Because nobody would implement create method for this scenarioBut what happens when we call the URI while creating sales order using the request XML?

How it would know that it actually need to call deep entity method and not create entity method?

Best Regards,

Lakshman.