fp2_struggle_compromise_truce_effect

fp2_struggle_compromise_truce_effect = {
	hidden_effect = {
		if = {
			limit = {
				struggle:iberian_struggle = {
					any_involved_ruler = {
						count > 1
						top_liege = this
						primary_title = { is_mercenary_company = no }
					}
				}
			}
			struggle:iberian_struggle = {
				every_involved_ruler = {
					limit = {
						top_liege = this
						primary_title = { is_mercenary_company = no }
					}
					add_to_list = fp2_struggle_compromise_truce_list
				}
			}
			while = {
				limit = {
					any_in_list = {
						list = fp2_struggle_compromise_truce_list
						NOT = { has_variable = fp2_struggle_compromise_flag }
					}
				}
				ordered_in_list = {
					list = fp2_struggle_compromise_truce_list
					limit = {
						NOT = { has_variable = fp2_struggle_compromise_flag }
					}
					order_by = realm_size
					save_scope_as = realm_scope
					set_variable = fp2_struggle_compromise_flag # variable ensures truces are set only once per couple
				}
				every_in_list = {
					list = fp2_struggle_compromise_truce_list
					limit = {
						NOR = {
							has_variable = fp2_struggle_compromise_flag
							this = scope:realm_scope
							has_truce = scope:realm_scope
						}
					}
					add_truce_both_ways = {
						character = scope:realm_scope
						days = 3650
						name = TRUCE_FP2_COMPROMISE
					}
				}
			}
			every_in_list = {
				list = fp2_struggle_compromise_truce_list
				remove_variable = fp2_struggle_compromise_flag
			}
		}
	}
}

As written in game/common/scripted_effects/03_dlc_fp2_scripted_effects.txt.