Duplicates are allowed to be imported

[GrandadEvans]

At the moment, there is nothing stopping a user importing a duplicate csv file (or other method). Leading to duplicate entries.
Currently, as the balance function is set, this will affect the balance, as it is worked from the previous balance altered to take into account the current transaction

[GrandadEvans]

Update: I was wrong in the original description.
The balance does not come from applying the new amount to the previous balance.
The balance is actually taken from the transaction entry itself, so is correct, it's just the fact that it allows duplicate entries.