How to use query prompt selector from a BEX Query in Dashboard version 6.0.5.0

Hi,

We're making a dashboard from BEX Queries.

How do we inlcude a prompt selector for month/year in the BEX so we can then use the Query prompt selector in Dashboard Design?

So far when we put the Query Prompt Selector Component in the canvas, the options, don't display the month dimension (so we can't select it)

Any ideas?

Thanks in advance!!

Flor