I need to change the “spend money” option to 3 purchase invoices, in order to delete a bank account that is added in “Banks”.
Call up those invoices via their Edit buttons. If the invoices are valid, but were paid from a different account, change the account. If the purchases did not really happen, delete the invoices. If they happened, but the account is now closed, proper procedure is to leave it open because the transactions are real. In that case, you mighty like to rename the account to include “(Closed).”