History mode for Prepaid Expenses

SUGGESTED

I am entering a new client in Sage from the Accountant's Trial Balance at year end through the Chart of Accounts starting balances. There is an amount in Account 1120 Prepaid Expenses and now I cannot get out of the History mode as I am getting a message "the sum of your Vendors information does not equal the current balance of account 1120 prepaid Expenses." If I enter that amount through my Vendors History it throws out the Accounts Payable amount on the Trial Balance. How do I fix this so I can leave history mode?