Trigger program

I have a file that is being written to an excessive number of times. For
example, one record should be written for each of 40 business locations.
Instead of one record, as many as 400 records are being written for some
business locations. I am trying to pin down when and by which program are
the records being written. According to my system administrator, journaling
did not help determine this. I believe that I need to add a physical file
trigger and write a trigger program. 

I have not written any trigger programs and need some suggestions. I have
identified the file update program. What I need to know is when is this
update program being executed and, if possible, what program is calling the
file update program. Any suggestions or ideas will be greatly appreciated. 

Thanks,
Bill Graziano
 
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