A/R Zero Balance Need to Offset Transactions

SUGGESTED

I have an account with a zero balance overall, but there are four transactions that in total net to zero.  I would usually do a zero cash receipt and select each of the transactions and post them as a zero cash receipt to remove them from the a/r trial balance.  However, there is one transaction that doesn't have an invoice/CM# to select, but it does have an amount, so it doesn't appear when I try to do this zero transaction.  I'm new to Sage 50 and would really like to clean this up.  I appreciate any suggestions that you may have.  I would love to have these old transactions that net to zero come off of our aging.  Thank you.