Peachtree beginning balance error

SOLVED

The question for Peachtree users : 

In 2016 yr book, I set up accrued expense accountant without beginning balance 

then I have two entries total about $(4800) in 6/30/16, the ending balance of 2016 should be $(4,800)

but in 2007,  there is no beginning balance 

so I delete the 2016 entries, find out there is $4,800 beginning balance in 2017, why the 4,800 come from? 

and I try to change the beginning balance in Chart of Account, but there is no select period time for 2017, only end up 2016 

Therefore,1)  I don't know why yr2017 has begining balance for 4,800

                2) I can not change my beginning balance 

                3)  I can not delete the account with a beginning balance 

Thanks for your help