If multiple parameters of different types but with the same name exist in tests, you can override only one of them. Only the values of parameters with the same type and name are replaced with the overriding value during execution.
To override a test parameter in an execution plan:
 in the 
                     			 Actions column of the parameter that you want to override. 
                     		   
                  		   The 
                  			 Set Execution Plan Parameter Value dialog box displays.
 in the 
                     			 Actions column of the parameter that you want to override. 
                     		   
                  		   The 
                  			 Set Execution Plan Parameter Value dialog box displays. 
                  		   
                  		
                in the 
                  		  Actions column of the parameter to undo the override.
 in the 
                  		  Actions column of the parameter to undo the override.