What is wrong with this simple one?

Why won't this work?

A unit must be added to the shop via triggers for it to be removed, at map initialization just add the unit to the shop and you'll be able to remove it.

Oh god...this fails...are you sure?

I propably know why i don't work.
Does your marketplace have the ability "Sell Uni" (Asud)?
When not you have to add this ability, then your trigger will work without changement.

Hmm, indeed they don't have the ability, but it won't work even if I add them...

it will work if you add the ability, just try it. I've already tested it.
Want me to attach the map?

...Sure...thanks for the effort

Fireeye is right, notice under the GUI action, it gives a tip.
It says something like; "This function only works if the shop has Sell Item" (for item functions) or Sell Unit" for unit functions.

I know...really, it does not work for me unless I add a unit to a shop manually via triggers...

I've already tried multiple settings with this same problem before and come to the same conclusion that the units or items have to be added to a shop via trigger if you want them removed later via trigger.

Bumps
Fireeye, please post your dummy map please..>>
I really don't want to add every Hero manually using triggers...