Applying an "unapplied receipt amount" to an existing customer invoice.
Receipts do not seem to be applied to particular invoices. This is because two or more non-zero transactions are outstanding, but haven't been applied to each other. Apply an “unapplied receipt amount” to an existing customer invoice.
You entered customer receipts (payments) in Bank Accounts/Deposits but didn't apply them to the customer invoices the receipts were intended to pay (you applied the receipt to “all”). Run the following command to apply customer credits that were inadvertently left unattached and to avoid showing credit transactions as negative amounts on customers’ statements.
Run the Receivables/Apply Credit Transactions command to apply the receipts (payments) to invoices. Select the customers through the date you specify, starting with the invoices with the earliest due dates.
This process is also performed automatically for balance forward customers when you print statements.