Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When your opponent activates a monster effect, while you control a Synchro Monster that mentions a Synchro Monster as material: Negate the activation, also, after that, Set this card face-down instead of sending it to the GY. You can only activate 1 "Scrap-Iron Signal" per turn.
--くず鉄のシグナル
--Scrap-Iron Signal
--Scripted by AlphaKretin
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_NEGATE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_CHAINING)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.negcon)
	e1:SetTarget(s.negtg)
	e1:SetOperation(s.negop)
	c:RegisterEffect(e1)
end
function s.cfilter(c)
	if not (c:IsFaceup() and c:IsType(TYPE_SYNCHRO)) then return false end
	local mt=c:GetMetatable()
	local ct=0
	if mt.synchro_tuner_required then ct=ct+mt.synchro_tuner_required end
	if mt.synchro_nt_required then ct=ct+mt.synchro_nt_required end
	return ct>0
end
function s.negcon(e,tp,eg,ep,ev,re,r,rp)
	return ep==1-tp and re:IsMonsterEffect() and Duel.IsChainNegatable(ev) and Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE,0,1,nil)
end
function s.negtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_NEGATE,eg,1,0,0)
end
function s.negop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	Duel.NegateActivation(ev)
	Duel.BreakEffect()
	if not c:IsRelateToEffect(e) then return end
	if c:IsSSetable(true) and e:IsHasType(EFFECT_TYPE_ACTIVATE) then
		Duel.BreakEffect()
		c:CancelToGrave()
		Duel.ChangePosition(c,POS_FACEDOWN)
		Duel.RaiseEvent(c,EVENT_SSET,e,REASON_EFFECT,tp,tp,0)
	end
end