Updating Customer Contact information on Invoiced Bill

Billing and AR, PUM 43 Tools 8.59.15

We have just implemented Billing and AR in our system. Initially we sent two Bills out to test the email format and Invoice Attachment. Our Customer contact did not have an email address associated with it at the time though.

We've set up a nightly batch job to mimic the BIJOB03 and these two Bills continue to try to send out and are failing each night because there is not an email address.

I can't find a way to update an Invoiced Bill and I can't find a way to pull an Invoiced Bill back from Invoiced to edit it in any way.