Bulk Request without mandating email address

  Customer would like to know if there is any way to change or modify the functionality of bulk orders which mandates the email address. Because, customer is having prepaid market, where people don't leave any email address. So, the contact will not always have the email address.

So, customer would like to get the confirmation whether this particular functionality is modifiable or not. If yes, then the change needed is in workflows, business services or the C++ code.

Asked the customer to to remove "Email Address" field from "ABO Bulk Request Instance" and also "ABO Bulk Request Exceptions" and also from the user key. Asked to remove this reference from the applets of Bulk Request. And from the business service user properties etc.. But, still customer is getting the following errors in the log files.