No show papi

I've been successfully adding Papi lights to a few FS2004 runways using Afcad but have one airfield who's lights refuse to show.

The airfield is EGHA, Compton Abbas. I've added papi2 to the left of both 08 & 26 but neither shows. Can anyone suggest reasons why not?
I'm adding a screenshot.

I should add that I've made lots of airfields with Ade & sbuilder & this is not one of mine - it's a UK2000 airfield & a good likeness of the real thing.