which integration channel do you use if your customer requests real-time transactional data synchronization between ERP and SAP Ariba buying and invoicing?

Which of the following are Forward Auction types?
There are 2 correct answers to this question.
Response:

which methods can you use to integrate purchase orders within SAP Ariba Buying and invoicing? NOTE: there are 2 correct answers to this question

Using the non-catalog item requisition with discounts, which of the following contract types' settings must be changed within the Contract Request Details screen? Note: There are 2 correct answers to this question.

What must you do to correct a receipt that was over-received in SAP Ariba Buying and Invoicing?