^ or Power() in update data expression

Hi.

I am trying to update a field with data using either ^ or the Power() funtion.

Floor(Random() *  2 ^ $(vars/@varNoOfGroups))

Genertates a GUI error and

Floor(Random() *  Power(2, $(vars/@varNoOfGroups)))

Generates an error in the Journal

2019-02-15 10:54:12 writer XTK-170016 You are not authorized to use SQL expressions. 'Power' cannot be processed.

Any clue on how to solve this. Tried to add the named right SQL SCRIPT EXECUTION to my user

Best regards,

Martin