I just wanted to give you some more information on what I found out about the transaction type: Credit card authorizations are tagged with AA and returned authorizations are tagged AV.
I've had this when adding a credit card to iTunes. There was a 1 Euro AA charge and shortly after a 1 Euro AV refund. Those types don't ever change in this case, I think only authorizations that get converted to charges will change the type.
It might make sense to ignore AV transactions also. Your list of transactions won't match, but there's always a refund to an authorization, so the amounts stay the same.
I just wanted to give you some more information on what I found out about the transaction type: Credit card authorizations are tagged with AA and returned authorizations are tagged AV.
I've had this when adding a credit card to iTunes. There was a 1 Euro AA charge and shortly after a 1 Euro AV refund. Those types don't ever change in this case, I think only authorizations that get converted to charges will change the type.
It might make sense to ignore AV transactions also. Your list of transactions won't match, but there's always a refund to an authorization, so the amounts stay the same.