What does a chargeable item class define?

Your customer discovers that the Collection Call List created with the dunning run is incorrect.
Which of the following activities do you do first?

Which object could be used in the BRIM solution to create recurring fees? Note: There are 2 correct answers to this question.

A customer must receive a yearly invoice. The recurring service needs to be posted on the contract account at the beginning of each month, to meet company accounting requirements.
Which billing plan cycle do you assign in the order creation process??

Which business partner role is required to trigger the business partner replication from SAP S/4HANA to SAP Convergent Charging?