Third Party Transactions E Way Bill

& when the invoice is made by Mr. A - he will mention both the parties in his invoice as well as eway bill ...... i,e. consignee & buyer ............ .......

Had this very same doubt. As i have checked both A and B are able to make waybills but is waybill actually required to be prepared by Mr B for his bill on C. How does he show that waybill has been done by him.

Also, when multiple items go for multiple people in single vehicle, then multiple bills with waybills are being issued by the supplier. If that is allowed then how is the scenario mentioned above wrong.

And what to be done in the case of Unregistered supplier who has no paperwork at all. How to prove authenticity of Mr. B in the same scenario if Mr. A is unregistered supplier. Please explain these small doubts?!