Report canceled with message 'No forms available',

Question

We are stumped. 
I created a simple ABAP HR report using the PNP logical database.  It pulls benefits info and master data for displaying on the screen.   (Associates Eligible for FMLA)   No ALV grid, just a simple write to the screen. 
The job runs fine in in the background as well as foreground in DEV, QAS, and STA .
But now that the program is in PRD, when we run it in BACKGROUND, the job CANCELS after 10 minutes.  
The spool lists the message 'No forms available', several dozen times, and then 'No memory for cua processer'.
Oddly, the program runs fine in forground.
Any clues how I can get this program to run in background?

Answer 1

Job log Messages:
12:48:38    Job started
12:48:38    Step 001 started (program ZPRCR_DISABILBITY_ELIGIBLE)
12:48:50    No forms available
12:57:47    No forms available
12:57:48    No memory for cua processor
12:57:49    Job canceled
I looked at the code and there are no ABAP 'check' statements, nor reference to sy-mandt. 
There is code in the 'at selection-screen' section that puts out a warning if the program is ran in foreground without a date.
  if pn-begda is initial and sy-batch is initial.
    message e000(zpa) with 'Please enter a run date'.
  endif.  
Other than that, the program runs fine in foreground in PRD, but cancels in background.  The same code runs fine in foreground and background in all our other clients.    Our BASIS group is stumped too.
Thanks
Doug