Any VW/Audi mechanics know about this problem

[wiz 1]

Posted something about this a while back and seem to be getting this engine fault light a lot, local garage has diagnosed it via pc as Fuel evaporation system flow rate faulty. Fault code P0441. Have cancelled the light twice now over a couple of months and on the way home its come on again. Cars running fine otherwise.
The cars a 2001 vw polo gti 1.6