petition_head_of_faith_prepare_petition_effect

petition_head_of_faith_prepare_petition_effect = {
	scope:puppet_or_actor = {
		petition_head_of_faith_clear_all_effect = yes
		set_variable = {
			name = pending_petition_head_of_faith_type
			value = flag:$TYPE$
		}
		set_variable = {
			name = pending_petition_head_of_faith_recipient
			value = scope:recipient
		}
		if = {
			limit = { exists = scope:secondary_recipient }
			set_variable = {
				name = pending_petition_head_of_faith_target_character
				value = scope:secondary_recipient
			}
		}
		if = {
			limit = { scope:$HOOK$ = yes }
			add_character_flag = pending_petition_head_of_faith_use_hook
		}
		else = {
			#peace of god makes excommunicating free against aggressors
			if = {
				limit = {
					NAND = {
						exists = scope:excom_request
						rite = {
							rite_has_parameter = tenet_peace_of_god_excommunication
						}
						scope:puppet_or_actor = {
							has_opinion_modifier = {
								modifier = declared_war
								target = scope:secondary_recipient
							}
						}
					}
				}
				set_variable = {
					name = pending_petition_head_of_faith_reserved_piety_value
					value = $PIETY_VALUE$
				}
				add_piety = {
					value = 0
					subtract = $PIETY_VALUE$
				}
			}
		}
		petition_head_of_faith_block_recipient_effect = yes
		petition_head_of_faith_begin_travel_effect = yes
	}
}

As written in game/common/scripted_effects/11_petition_head_of_faith_effects.txt.