Use @prompt within a universe filter

Hi all

I want to use @prompt to get user response in order to use different filters

in specific

if user selects 1 then filter last 3 month

if user selects 2 then filter last 6 month

when I try to do it in Universe i get error

Error parsing the expression: ExpressionEncoder.encodePrompt: Prompts with one argument are not implemented

. (IES 01028)

Any ideas???

Shlomi