Cap on Honorary Titles?

[Anou]

Playing a Roman Empire game and I want my first born son who doesn't have the trait Born in the Purple to have the Despot title. His grandfather already gave him two Honorary Titles and I'm trying as his father to give him the title of Despot, but I can't give it to him, only Court Fool. Is this WAD or a bug?

 

[Dracko81]

# Byzantine Titles
title_despot = {
	dignity = 0.25
	realm_in_name = yes
	grant_limit = 1
	opinion_effect = 25
	
	monthly_salary = 0.1
	monthly_prestige = 0.01
	
	counts_as_purple_born = yes
	
	allow = {
		is_female = no
		is_close_relative = FROM
		FROM = {
			is_feudal = yes
			OR = {
				has_landed_title = e_byzantium
				has_landed_title = e_roman_empire
			}
			NOT = { religion_group = muslim }
		}
		[COLOR="#008000"]NOT = { has_minor_title = title_sebastokrator }
		NOT = { has_minor_title = title_caesar }
		NOT = { has_minor_title = title_kouropalates }[/COLOR]
	}
	
	gain_effect = {
	}
	lose_effect = {
	}

	message = yes
}

Only one Person can hold this title, does someone else hold it? Does he hold one of the green titles?