BPCS 6.04 Invoice Release and Billing Automation Technical Question

I am trying to automate the Billing Process so that it can run at night all 
invoices.  I have created a RPGLE program that selects the Orders that we deem 
to be ready for invoicing and then it Calls BIL501B with the parms BIL501B 
needs. 
 
    It updates the fields in the BBH, BBL, and ECH file as if they were 
selected through the regular billing selection program BIL501D1. 
 
File/Field     Description                  Value needed
BBH/BHWSID     Workstation Name           AUTOBILL 
BBH/BHCTRL     Document Control#          Sequential Number 1,2,3, etc
 
BBL/BLWSID     Workstation Name           AUTOBILL 
BBL/BLCTRL     Document Control#          Sequential Number 1,2,3, etc
 
ECH/HINUSE    In Use Flag                 Y
 
 
The problem I am encountering is that it generates all the reports, invoices, 
and updates the needed files, but they come out with Zero dollars on all of 
them and it does not get rid of the BBH & BBL reocrds. 
 
Has anyone else run into this?     
 
Thanks in advance for any help offered.   Kevin W.