Persist parameter first exection value

Hi everyone,

I'm trying to do the next: I have a report with a parameter 'user'. By default, the parameter user has the value 'test'. This report is called from a website, that pass a value to the parameter by url, so we can change the default value of the 'user' parameter.

What I need, is to mantain the first value passed to the parameter, instead of the default value. I mean, imagine I click the link that call to the report, passing the value 'user1' to the parameter 'user', and open me the report viewer, showing the user1 in the report. But, if I change the input parameters of the report viewer, and click on 'View Report' button, the value used by the report is the 'test' value. 

I would like to mantain the value passed the first time the report is called.

Is there any way I could do this? Sorry for my english!



Thansk in advance!