You will have to determine what has caused the balance to be out. Is the total of all the invoices less the Pre-Paid expenses correct or is the problem the total in the A/P being incorrect. Once determined you will have to unlink the A/P and make the necessary entry to correct the situation. If you are uncertain do not unlink the account without some guidance from a Sage Consultant who can work with you, on-site or remote. This may cost a few dollars but it could be worth it in the long run. Consultants are not Sage employees but are independent business people who are trained and specialized in Sage 50. 

thank you !