As with our other help series blogs, I have focused on an issue that is fairly common on support. Hopefully this helps and do feel free to get in contact with myself or any of my colleagues if you would like any more information. Always happy to help!
If you have ever discovered you've made a mistake on a payment which you've already posted, this is how you solve the problem:
To reverse a payment in the A/P-A/P Accounting module, open the payment you need to reverse and choose the Options> Accounting Cancellation on the right hand menu.