The following steps are an easy way to access the receipt or payment transaction

EXAMPLE: If for example, you are trying to unallocate it from the invoice, without having to go to the Banking tab, or if you need to take note of the date the payment was made, especially if the invoice has been partially paid at different dates, to be able to quickly localize your transaction within the Banking tab. 

Please see below how to access directly the transaction window from an invoice

1. Go to the Sales tab or Expenses tab
2. Click into the invoice
3. From inside the invoice window, click on the blue link [Payment] next to the date
4. From the next window "Payment and allocation" :
   1. you can see all the different amounts paid if partial payments apply, and the corresponding date for each of them.
   2. Click on the amount in blue.
5. You are brought to the transaction window, either a "Customer receipt" or "Vendor payment"