Onuse with vocation req

[Swiff]

So I got this script from http://otland.net/f81/catch-summon-monster-vial-157760/ Virrages,

I would like to use this for my custom vocation, thus I'd need to make a "ifNot" vocation id 18 then "sorry, only master ultra giga super sayajains (with green hats) can use this" ~
I thought for sure this has been requested before, I actually did few years ago on Otfans but it's down - But I couldn't find any onUse item with a voc req on it.

Can I get some guidance?

Thanks in advance

 

[Limos]

local vocations = {1, 2, 5, 6}

if not isInArray(vocations, getPlayerVocation(cid)) then
	doPlayerSendCancel(cid, "This is not for your vocation.")
	doSendMagicEffect(getThingPos(cid), CONST_ME_POFF) 
	return true
end