Capture the Flag

Ok I've tried many ways to get this ctf thing working but it never does. Is there some way of making so that the hero cannot pick up an item unless their inventory is completely empty?

take an event

Unit acquires an item

conditions:

unit is a hero = true

actions

if
item in slot 1 = no item
item in slot 2 = no item
item in slot 3 = no item
item in slot 4 = no item
item in slot 5 = no item
item in slot 6 = no item
then
do nothing
else
unit drop item.

Or u could just give him an inventory with 1 slot?

lol that cant work, see... if the hero takes the item, he have 1 item in slot before the actions run ;)

oh right :P then just add the and condition and item in slot is not item being manipulated