Undo a Trust Transfer Entry in Timeslips

Hello, 

I entered a payment to the client's account; there was an overpayment which will all be applied to next month's invoice (and none available for trust). However, I also clicked on the Transfer money button, which i shouldn't have. So now the A/R account shows a zero balance, instead of the credit balance which will be applied to next month's invoice. How do I undo the Trust transfer entry.  At this point, we have not started the new month's billing yet, so i can remove the trust transfer entry directly but i don't know how to do that. Can somebody kindly help?

thank you.