How do you proceed?

The scope item Solution Order (4GT) has been activated in your SAP S/4HANA system. You add multiple items to a solution order that you want to see combined on one billing document for your customer.

How do you proceed?
A . In the solution order itself, you set a flag called Combined Invoice which will lead to one billing document per solution order being created when processing the billing due list for the customer.
B. In the business partner master record of the customer you are selling to, you set a flag called Combined Invoice which will lead to one billing document per solution order being created when processing the billing due list for the customer.
C. The solution order ID is automatically used as a split criterion by the SAP S/HANA Cloud system when creating billing documents. This means that no additional set-up is needed to be able to combine all items on one billing document for your customer.
D. Using the extensibility framework, a custom field is created at billing document header level and it is filled with the solution order ID. The solution order ID is then used as a split criterion by the SAP S/HANA Cloud system when creating billing documents.

Answer: A