Why can’t I put a bank account in a journal entry, this is useful in case I want to transfer the old data to the company
It’s the base of how Manager works. You simply cannot and you will never be able to do it.
I know that you are trying to distinguish between actually monetary operations and the entry bond, but in historical operations we need the possibility of that in my opinion
Do you mean to set opening balance?
I mean re-entering previous operations from previous periods, for example
Why would you re-enter transactions from previous periods?
Manager is a perpetual accounting system, there is no need to do this
Maybe from a different software.
OK, but you do not need to post to bank accounts to accomplish that - just set the correct opening balance, no?
As the software is designed, yes. As for every other account.