Duplicate jobs even if requested just 1 copy

[KTF]

Hi,

We are experiencing a really weird issue here. We are printing from oracle  apps to cups, the architecture consists in a central CUPS server, the Oracle systems run CUPS and point directly to the central server. Randomly, some jobs requesting just 1 printout are printed multiple times, like twice, three times even 7 times. All servers are Redhat Enterprise Linux ES, central cups server is RHEL 3 (with compiled from source cups, v1.22), the oracle apps servers are RHEL4 with cups 1.1.22-0.rc1.9.11 (latest and greatest(?)).

I checked the logs (yes, with debug enabled, not debug2 - I used to but I ran out of disk space rather quick...), I had sniffers running on the central server and what I got to is something like this:
- on the originating server I get something like this:
....
[Job 74568] Unable to get job 2216769 attributes (client-error-bad-request)!
PID 25740 stopped with status 1!
UpdateJob: job 74568, file 0 is complete.
...

job 74568 is the local job number, 2216769 is the job number on the central server
- the sniffer on the central cups shows a 400 error (Bad request)

Other facts: the printers related to this sort of incidents are mostly HP, various types and Zebra, various types as well. I have built another cups server running on RHEL 4 ES, builtin cups, the same issue, it doesn't seem to be OS dependent or cups version dependent.

Is anybody able to give me some hint on how to fix this, what should I look at etc.

Thanks in advance, any help would be highly appreciated.

Thanks,
KTF