Default prompt to current MM and also provide LOV {01 to 12}

Seems like this simple requirement but is a challenge in WEBI

I have a column in a table in the universe called 'Month' = to_number(to_char(SRV.ADMIN_LOG.LOG_DATE,'MM'))  which gets list of months {01,02,03,...12}

I am then using this field to be as prompt in webi report for the end user to select MM from the LOV of [01 to 12]

How can I default to current month(MM) in this prompt and also show the LOV incase user wants to change it?

using BO 4.0, WEBI 4.0 and UDT

Vishal