For all Product and Operation accounts :
Debit transaction means money is getting out (ex : I bought a coffee).
Credit transaction means money is getting in the account (ex: yeah! I received my pay).
The balance is money in the account, so available balance.
For all credit accounts :
It's the same than for the previous example.
Debit transaction means money is getting out (ex : I bought food for my family).
Credit transaction means money is getting in the account (ex: payment from the checking account to the credit card)
The balance is only available for the account and not by transaction and is money that is used, so its balance outstanding.
