Change the values of Variant

Hi my friends,

I call a query using a FM, one parameter of this function is a variant parameter, this variant is attached in the query not in my report ZHRPE_TES2.

My problem is that I want to change dinamically the values of the parameters of the variant in order to execute the query so I have different results, for example I would like to change the date range of the variant.

So my problem is how to get the variant, change the values and finally again execute the query.

Image may be NSFW.
Clik here to view.

These are the parameters of the variant for the query.

Image may be NSFW.
Clik here to view.