Hi Sohaib,
What I have done is
1.Open AOT..Navigate to Ledger Table...We have "chart of accounts", which as you said is a recid... it has a drop down where we can select a value, and changed it to new Chart of accounts value.
I am trying to create and post a new journal. I am not doing anything for already posted journals. there were no journals appearing to me because I have deleted them using sysdatabasetransdelete