How to find who is updating particular PF ?

 Hi all,
 
 
 I need to add 2 new fields to a sales extract file and also populate them.The 
problem is I am not able to figure out how the file is getting updated.(which 
programs is updating this file)
 

  Whats known:
 
 The sales Extract file is journalled and the journal entries are created by a 
program which is a part of the datamirroring software. There is a constantly 
running batch job (also a part of Datamirror) which is most likely monitoring 
updates to the sales file.
 The object locks for this batch job has a *USRQ object which leads me to 
believe that the data from the sales file is written to the extract file using 
the *USRQ object.  Since the Datamirroring package is a 3rd party tool, I do 
not have access to the source code.
  
 I have verified that the Sales extract file is not DIRECTLY referenced/updated 
thru programs (scanned source members and also did a dsppgmref) / queries / 
Sqlpkg / dataareas / triggers).
 
 How do user queues work?? Is there anything else that I need to check. 
 
 Will appreciate if anyone could help. Thanks in advance. 

Thanks & Regards
  Mahesh Pawar

                
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