You can allocate transactions in your customers record using Account Allocation.

This allocation method creates a Customer Allocation transaction in the customer record and audit trail.

The transaction allows you to check allocations and unallocate them if required.

1. Go to Contacts and select Customers.
2. Open the relevant customer record.
3. Search for the allocation.
   
   ▼ How to search for the customer allocation

   Change the From and To dates to match the customer allocation date. The allocation date is the same as the most recent transaction within the allocation.

   EXAMPLE:

   When you date an invoice 1 June and receive payment on 15 June, Sage Accounting uses 15 June as the allocation date. If the payment date is earlier that the invoice date, Sage Accounting used the invoice date instead.

    Change the Type dropdown to Customer Allocation.

4. Select the allocation to open it.
5. Untick the checkbox for both of transactions in the allocation.
6. Select Save.

You've removed the customer allocation. Invoices and credit notes are now outstanding. Customer receipts remain on the customer's account as a payment on account.