pam_enforce_title_succession_effect

pam_enforce_title_succession_effect = {
	scope:target = { save_scope_as = succession_title }
	scope:target.holder = { save_scope_as = succession_holder }
	scope:succession_title = {
		current_heir = { save_scope_as = enforced_heir }
	}
	if = {
		limit = {
			exists = scope:enforced_heir
			NOT = { scope:enforced_heir = scope:succession_holder }
		}
		create_title_and_vassal_change = {
			type = stepped_down
			save_scope_as = succession_title_change
			add_claim_on_loss = no
		}
		scope:succession_title = {
			change_title_holder_include_vassals = {
				holder = scope:enforced_heir
				change = scope:succession_title_change
			}
		}
		resolve_title_and_vassal_change = scope:succession_title_change
	}
	if = {
		limit = { scope:succession_holder = { is_ai = yes } }
		scope:succession_holder = {
			add_opinion = {
				target = scope:actor
				modifier = meddling_church_opinion
			}
		}
	}
}

As written in game/common/scripted_effects/pam_effects.txt.