If you have a payment on account, apply it to an outstanding invoice balance by allocating the two transactions together.

1. Go to Contacts, and then click the applicable contact.
2. From the Manage menu, select Account Allocation.
3. Select the check box for the payment on account and the check box for the invoice to which you’re applying the payment.
4. Ensure zero (0.00) appears in the Left to Allocate field. The amount left to allocate must be zero to save the allocation.
5. Click Save.

The allocation date will be the date of the most recent transaction when you allocate transactions together for a contact. If you allocate an invoice dated 6/9/2018, a credit note dated 6/20/2018, and a payment dated 6/11/2018 on 6/28/2018, the allocation date will be 6/20/2018.