How do I unpay a Customer Invoice when the Payment Details (i.e. Date Paid and Amt. Paid) are greyed out?

For example:

To unpay an invoice when the Payment Details are greyed out:

Step 1: Change Customer Receipting option

• Click on Debtors toolbar option.
• Click on the Setup tab.
• Change the Customer Receipting option to Optional.

Note: Payment Details of a Customer Invoice are greyed out when the Customer Receipting option is set to Compulsory.

Note: If Customer Receipting is set to Compulsory, this will be the only available method of recording payments from customers. If Optional is selected, a receipt can be recorded using any of the 3 methods, i.e. transaction entry screen, customer invoices listing screen and customer receipts.

 Step 2: Delete receipt transaction in Cashbook:

• Click on the Cashbook toolbar option.
• Click on the transaction you wish to delete,so it is highlighted blue.
• Click on the Delete button.

• Click Yes to Confirm message: 'This transaction is linked to one or more receipts. Deleting this transaction will also un-bank the receipts. Do you want to continue?'
• Click Yes to Confirm message: ' Proceed with deletion?'

Step 3: Delete the customer receipt:

• Click on Debtors toolbar option.
• Click on the Receipts  tab.
• Click on the (now un-banked) transaction so it is highlighted blue.
• Click on the Delete button.

• Click Yes to Confirm message: 'Delete receipt reference '1'?