You may, for a variety of reasons, have unapplied credits in your AR account or unapplied debits in your AP account.  These amounts may either partially offset other invoice/bill amounts, or fully offset them, resulting in a credit balance for a customer or a debit balance for a vendor.

Technically, these amounts should be reclassified at period end to either a deferred revenue account (for credits in AR) or a prepaid expense account (for debits in AP).

Generally, this is ignored during most months of the year, but depending on your reporting requirements, should be done at least at year end, and perhaps as often as quarterly.  As always, speak with your qualified accountant as to what you should do and how you should do it.

It may be tempting to process individual transactions, say by journal entry, to each customer/vendor in order to clear these amounts.  This is a lot of work!!  Not only will you be doing many individual transactions at period end, but you will have to do just as many individual transactions to reverse these reclassifications, then you will need to go to the effort to apply the journal entries to each other!

A better way:  since this is only for balance sheet presentation, I suggest simply totaling up the overall amount for each account, and doing one bulk entry.  This way, you won’t have so many entries to do, and you won’t need to go through the process of applying each customer’s individual amounts against each other.  The downside is that your AR or AP aging won’t agree with the AR general ledger account balance (since you aren’t applying these amounts to individual customers/vendors), but this shouldn’t be an issue for your external accountant or any external users of your financial statements.