How to enter Bill to Site on Generate Balance Forward Bills Conc job

Hi all,

We are on 12.1.3 version of Oracle EBS. We are running Generate Balance Forward Bills report for few of our customers where we have a requirement to run this report by site. But on the Generate Forward Billing concurrent job, the fields for entering Bill to Site low and High are both disabled. They remain disabled even when customer number is entered.

Questions:

1. How do we enable these 2 fields?

2. When we enter customer number in the parameter screen, the report doesn't seem to work. I removed the customer number and ran the report for all and it was successful. But the problem is, this report can be very big and hard to read. How can I run the report for just one customer and respective site at one time?