pam_split_ecclesiastical_title_interaction_effect

pam_split_ecclesiastical_title_interaction_effect = {
	scope:secondary_recipient = {
		save_scope_as = new_ecclesiastical_holder
	}
	scope:secondary_actor = {
		save_scope_as = secular_ruler
	}
	scope:recipient = {
		save_scope_as = clerical_region_holder
	}
	scope:secular_ruler.capital_county.clerical_region_title ?= {
		save_scope_as = clerical_region_title
	}
	# Interaction tooltip reads on_accept before the split
	show_as_tooltip = {
		pam_split_ecclesiastical_title_outcome_effect = yes
	}
	hidden_effect = {
		scope:secular_ruler = {
			capital_province = { save_scope_as = region_capital }
			split_clerical_region = {
				name = CLERICAL_REGION_PROVINCE_TITLE_NAME
				save_scope_as = new_title
			}
		}
		# A failed split leaves scope:new_title unset
		if = {
			limit = { exists = scope:new_title }
			pam_split_ecclesiastical_title_outcome_effect = yes
		}
	}
}

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