Deletion of Bank Keys

Dear Gurus,

I have already some bank keys existing in my PRD clint as it is a client copy. Now my clinet asks for deletion of all existing bank keys (excluding his house banks). But when i goto OBR4, SAP says it deletes all the bank keys but the comapny code should not be productive.

Is there any other way to solve my problem? Mark for deletion flag can be set but the values are seen in F4 help.

Regards

Jaya