Jim,
First to go over some definitions:
- Sales Amount is the subtotal, not including any freight, tax, misc, discount, etc. In many cases it will be the same as the total of the document, but not always.
- Original Trx Amount is the total of the transaction, including everything.
- Current Trx Amount is what is due/open, considering everything that has been applied to this transaction, whether posted or not. Current Trx Amount for Receivables transactions will also be 0 for any voided transactions (column for this is Void Status).
All that said, SmartList is not date sensitive (in other words, you cannot use SmartList to get results as of a particular date). So unless absolutely nothing has been entered into the Receivables module since 12/31/2012, you cannot use SmartList to reconcile as of 12/31/2012.
To get a historical trial balance, you can go to Reports | Sales | Trial Balance and choose Historical Aged Trial Balance.