Replacement path for select option variable

Hi,

I need to calculate in columns an amount dynamically for all the values of a characteristic. For this i need to create a selection inwhere i will calculate my result, but how should i do to make the result appear with its label on each column.

example : my characteristic is called EVT and have the values : 'A', 'B', 'C', 'D'...

the user should execute the query (without entering any filters) and see a result like this :

A | B | C | D | ...

key1 1 5 3 8

Key2 .. .. . .. .

Key3 . .. . . .. . . .

I tried to create a replacement path variable, but i can not see the EVT filter variable to use it as replacement path. what is the problem ? and how should i do to create a replacement variable ?

thanks.

Raed