Client with prepayment

Hi Team

Can you help. I have noticed one of my clients has £734.92 in prepayments but they do not have that much credit. I think it may be from when I first started using QuickFile and did not understand how to do things correctly so may have manually paid an invoice instead of tagging from the bank payment. What would be the best way to deal with this. Do I go back to the beginning of their account delete all transactions but not invoices and payments and start tagging again? I can see on 1 invoice that I have allocated 3 lots of payments but cannot see where I have taken them off again. A real mess and I need some help with this please.


Just delete the untagged entry in bank or cash (what ever source ) was used to record prepayment, no need to alter any invoice or tagged payment