Remove a pick possible ? Disable it ?

[panda]

I'm creating the Dracolich template/subrace and for this I need to be able to remove the tpDragon Type race and replace it with tpUndead.

I tried for 2 hours to find a way to remove it without succes.
I finally found in some post on the forum that remove a pick is not possible. And it must be disabled. so I tried this script but without success

~if we've been disabled, get out now
doneif (tagis[Helper.Disable] <> 0)

perform hero.child[tpDragon].assign[Helper.Disable]
or
foreach pick in hero where "thingid.tpDragon"
perform eachpick.assign[Helper.Disable]
nexteach

but it doesn't work.

Anyone as an idea how to solve this ?

[ShadowChemosh]

So NoTypeAbil.? is the tag that is suppose to be placed on the hero. In this case NoTypeAbil.tpDragon. But while the tag exists it does not appear to work in 5e.

[panda]

Ok I report a bug