How can identify webi modifications?

I Experts,

I need to identify webi creations and modifications from a specific date, the modifications must be from the user side.

The query that I'm using is that one:

SELECT * FROM CI_INFOOBJECTS WHERE SI_KIND='webi' and SI_INSTANCE_OBJECT = 0 and SI_UPDATE_TS BETWEEN '2014.08.01' AND '2014.09.02'

I saw when there is a publication from a webi and you make some changes on the parameter of the input controls, the modify date from the webi document changes. That’s modifications are not interesting to me, what is interesting for me is changes related to the own webi document like change variables, graphics any changes unless prompts parameters.

Is any way to list all web Intelligence with that changes without consider modifications from a publication?

Thank your consideration