Payment Proposal for 1 Vendor, w/ invoices in multiple companies

I am working with a test example for creating a Payment Proposal within standard AX (AX 2012 R3, cumulative update 8).

Is there a means of combining payment proposal lines where 1 party (Vendor in this case) has 2 payment transactions, each transaction in a different company?

Currently, when selecting the "Include Vendor Invoices from other Legal Entities" parameter, I render 2 payment proposal lines based on the 2 Vendor Open Transaction that exists for the Vendor.

The method of payments, for both transactions being used, is also set to Total as well for its PaymSumBy field (labeled Period), in both companies.

Any ideas?

Thanks in advance for your assistance