Verify Apple ID: Why does apple need my bank account number?
And why is the correct information invalid? Anoying..
If you have received an email purporting to be from Apple but asking for any bank information, that email is almost certainly a fake, sent by criminals trying to get your account information. See:
http://support.apple.com/kb/HT4933
If that's not what you mean, please post back and clarify your situation.
Regards.