Can I edit a paid Bill?

Fixing a Bill is only allowed if the Bill payment is still pending approval. If it's approved, it is not possible to fix the Bill. 

Steps:

1. Open the Payment request by selecting Settings and Payment tracking
2. Locate the Bill under Payment request and open the Bill 
3. Scroll down to the Withdraw payment request
4. Type in a reason and select Withdraw payment
5. Locate the button [...] and select Remove Bill
6. Go to Manage bills under the Accounts Payable module and open the Bill 
7. Select Fix bill and submit for approval (if needed)