How do you clear "Unnettable" intercompany transactions?

When netting intercompany AR and AP transactions, we are encountering transactions that are marked as "unnettable". In our environment, this all appear to be from imported journals from our expense report system. Each expense item creates intercompany entries during autobalancing and consequently there may be more than a single set of IC AP and AR entries for each company. An expense report journal with only a single expense item for a company is not being marked as "unnettable".

I don't quite understand the limitation since we are netting IC AR and AP transactions within a company and they are unrelated. In fact, we would like to clear the IC balance by transferring cash between the companies. This transfer creates the IC transaction that we want to net against the outstanding IC transactions.