Reset Parameters in Report Services

Question

I have a report that lists people and flag.

idPerson | nmPerson | Flag
01       | Carl     | 0
02       | Eva      | 1
03       | Jhon     | 1

I want to update the flag when I click on the flag field. To do this, I created a dataset that calls a procedure to update the flag on table passing the parameter @idPerson. The parameter @idPerson allows null value. In the action of the flag field I put to go to the same report, with @idPerson as parameter.

The problem is that it only works when I click on different lines because the parameter updates with a new value, if I click on the same line, the report does not execute the procedure.

I think I have to reset the parameter but I do not know how I do it.

How I do to reset the parameter value to default, or another way to update the flag on table without go to another report?