SRM Creating Duplicate PO

Here is my scenario:

-SRM 7.01

-Classic Scenario

-Create and approve shopping cart having two lines, each to different supplier.

-CLEAN_REQREQ_UP returns message "SRM / BE Item mismatch in SC."

-Line 10 created two purchase orders in the backend SAP R/3 system, duplicates.

-Line 20 failed to created a backend purchase order.

-Status of line 10 updated with the last purchase order created, and is ready for goods receipt.

-No runtime errors in ST22, no applications errors in SLG1.

Why is SRM creating a duplicate purchase order for the same supplier on the first line, and failing to do anything with the second line? I can reproduce this with any supplier, as long as I have a shopping cart with multiple suppliers. There does not appear to be anything wrong with the supplier - I can create a shopping cart and purchase order with any supplier if it is the only one on the request. But, as soon as I include more than one supplier on the shopping cart I get this unexpected result. Any assistance would be greatly appreciated. Please let me know if I need to provide more information.

Thank you!