You need to change standard sales processing logic and your requirement cannot be met in Customizing.
What options will ensure there are no changes to SAP-delivered objects? Note: There are 3 correct Answers to this question.
You want to configure that only complete sales documents can be saved. How can you achieve this?
To me right answer is C
Which business partner categories can you use to create customer master records? Note: There are 2 correct Answers to this question.
What are the effects of posting the goods issue during a sales process? Note: There are 3 correct Answers to this question.
How does the system determine the warehouse number in an order-to-cash process?