Quest is working to horse lvl1

[iRETEMAG 157]

quest horse_call begin
	state start begin
		when 50051.use with horse.get_grade()>=1 and horse.get_grade()<=10 begin
			if pc.is_riding() then
				horse.unride()
			elseif pc.is_polymorphed() then
				syschat("Transformed.")
			elseif horse.get_grade()==0 then
				syschat("No horse.")
			elseif horse.get_grade()>=2 then
				syschat("Incorrect item.")
			else
				horse.ride()
			end
		end
	end
end

 

This quest is working to normal horse, but, changing the quest to:

 

quest cavalo_chamar1 begin
	state start begin
		when 50052.use with horse.get_grade()>=11 and horse.get_grade()<=20 begin
			if pc.is_riding() then
				horse.unride()
			elseif pc.is_polymorphed() then
				syschat("Transformed.")
			elseif horse.get_grade()==0 then
				syschat("No horse.")
			elseif horse.get_grade()>=21 then
				syschat("Incorrect item.")
			else
				horse.ride()
			end
		end
	end
end

 

The second one don't work correctly...  Why?