To unallocate a receipt or payment from an invoice or credit note

1. Go to Banking.
2. Click the bank account used for the receipt or payment.
3. On the Activity tab, click the receipt or payment to remove the allocation.
4. From the bottom of the Customer Receipt or Vendor Payment window, unmark the checkbox for the relevant invoice or credit note.
    NOTE: If the receipt or payment covers multiple invoices or credit notes and you unallocate one, the remaining transactions are unaffected. Select All from the Display option, then choose the correct invoice or receipt to reallocate the unallocated amount.
5. Click Save to update the transaction.
6. Click Yes to save the unallocated amount as a payment on account.

To unallocate an invoice and credit note

 NOTE: Allocating an invoice and credit note, or creating a credit note within an invoice, generates a customer or vendor allocation transaction. Before you can change or void the invoice or credit note, you must first remove this allocation.

1. From Contacts, click the required contact.
2. On the Activity tab, click the relevant allocation transaction. 
    NOTE: The date of the allocation transaction is the date you allocated the invoice and credit note.   
3. Unmark the checkboxes for the invoice and the credit note you want to unallocate.
    NOTE: To unallocate one invoice and credit note from multiple transactions, click the credit note, adjust the amount to pay, and save. Remaining transactions stay unaffected. Example: Invoice $50, credit note $100, amount to pay is -$50. 
4. Click Save.