magic wall max items per tile

[Ulti]

i need help

for example

tileLimit = 20 - in config.lua

when there is 20 items on tile player cant shoot there magic wall

can someone help me?

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_DISTANCEEFFECT, CONST_ANI_ENERGY)
setCombatParam(combat, COMBAT_PARAM_AGGRESSIVE, FALSE)  
setCombatParam(combat, COMBAT_PARAM_CREATEITEM, 1497)

function onCastSpell(cid, var)
	return doCombat(cid, combat, var)
end