I made an internal transfer between two of our bank accounts. Unfortunately I did not set the correct date for the transfer and already clicked on "Confirm" before recognizing this.

How do I cancel an internal tranfer. I have checked the "Allow cancelling entries" for the Journal but when I try to cancel the internal transfer it still tells me: You cannot modify a posted entry of this journal.
First you should set the journal to allow cancelling entries.

How do I solve this? Thank you