Duplicate MDN

Hi Experts,

I  have a scenario ECC (855 Message-Purchase Order) --> PI B2B Add on --> Supplier

1. In this scenario we are sending back second MDN to the supplier again, which is not needed.

2. At times the Supplier gets a XML Message, though we send an EDI Message.

Could you please guide me how to overcome the above two points?

Regards,

Prasad.