Outstandings

I would like to get the accounting impacts for the following :

1. Ledger balance of supplier gets tallied (ledger consists of sales entry & credit/debit notes),  but both sales & credit notes are displaying as outstandings in the books despite zero ledger balance. Would like to know will this have any impact

Impact for :

2. Old year credit notes still shown as outstandings

3. Advances under outstandings

Kindly revert