Multiple products from different suppliers = Shipping Error

So I created a bunch of products. Some come from supplier A and some from Supplier B. Supplier A has its own shipping rates and Supplier B has their own rates too.

I create a series of rates.

  1. Ground A
  • assigned to Supplier A

  1. Ground B
  • assigned to Supplier B


    If I add an item from supplier A to my cart and check out, it gives shipping rates and lets me buy. If I add an item from Supplier A and from Supplier B it says, no shipping methods are available.

    What is the conflict?