Problem with Transaction References not looking at prefix...

it appears that the Transaction References do not look at the prefix when determining uniqueness.

I have 2 Supplier Transaction References set up.  1 with no prefix (generic payments) and 1 with a prefix (checking account and check number as a reference)

When entering a Supplier Payment, only the reference number is check for uniqueness, preventing references with the same number but different prefixes from being accepted.

It seems that the Supplier Payment form will return the Reference List (ref_list) index but not the prefix value.

Is there an easy way to allow duplicate reference numbers with different prefixes?
Thanks