I enabled the database logs for a table (for a field of a table in update exactly). I enabled it in order to check the previous price and the current price in case of change. 

Below I can see the current and previous value. 

I can edit a report "SysDatabaseLog" to check all modification. 

But the problem is I need to add a filter, for example on itemgroup or some other criteria. Is it possible to add this on the report ? Or how can I do it ? 

Maybe it is possible to modifiy this code ? (The report name is SysDatabaseLog I renamed a project for this example).