BankAccount_isOpened is to be called on payment_value in the 2 caller scripts, not on context. This denotes a naming convention violation, as those scripts are called "BankAccount_*".
Remove payment_state variable as it's now unused.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28840 20353a03-c40f-0410-a6d1-a30d3c3de9de