This has nothing to do with the balance sheet being in balance-- these are transactions that haven't been posted yet to the general ledger and it could be only the first transaction of 76 is out of balance for some reason (debits do not equal credits).  In GL-O there is and out of balance report, but if you have no other transactions before the out of balance one you may not be able to get there-- instead you can go to GL-C  and print all unposted (U) transactions to find the out of balance one(S).
Then you will have to use GL-P to edit the offending transaction.
Hope this helps.

The GL-P was used to correct the out of balance transaction and the warning is gone.  
 
There is other issue now. The  transaction missing was a credit to A/P (Acct# 2020) but the missing Invoice for the amount causing the difference is not showing in A/P Aging as invoice to be paid. The balance in books is higher compare to A/P Aging. How to fix this new issue?
 
Thank you for your prompt response.