Is MICR number required for lockbox file processing?

We are looking to exclude MICR numbers from our current lockbox BAI2 files that we receive from the bank in order to avoid the helpful lockbox functionality that adds the MICR numbers automatically to some of our customers.

Basically, if we only include the customer number and the invoice number in the lockbox file, is this good enough to pass the lockbox validations and to create and apply the receipts via the lockbox?

Or is MICR number always required in BAI2 file?

Would appreciate any suggestions here as the MICR number right now is allowing the new bank accounts added automatically to the incorrect customers.