diplomacy_foreign_1150_successful_county_switch_effect

diplomacy_foreign_1150_successful_county_switch_effect = {
	# Give your county/vassal to the neighbor
	if = {
		limit = {
			scope:county.holder = scope:neighbor
		}
		create_title_and_vassal_change = {
			type = returned
			save_scope_as = change
			add_claim_on_loss = no
		}
		scope:county = {
			change_title_holder = {
				holder = scope:ruler
				change = scope:change
			}
		}
		resolve_title_and_vassal_change = scope:change
	}
	else_if = {
		limit = {
			scope:ruler_vassal = {
				highest_held_title_tier = tier_county
			}
		}
		create_title_and_vassal_change = {
			type = returned
			save_scope_as = change
			add_claim_on_loss = no
		}
		scope:ruler_vassal = {
			change_liege = {
				liege = scope:ruler
				change = scope:change
			}
		}
		resolve_title_and_vassal_change = scope:change
	}
	else = {
		create_title_and_vassal_change = {
			type = returned
			save_scope_as = change
			add_claim_on_loss = no
		}
		scope:county = {
			change_title_holder = {
				holder = scope:ruler
				change = scope:change
			}
		}
	}
	# The neighbor gives his county/vassal to you.
	if = {
		limit = {
			scope:neighbor_county.holder = scope:ruler
		}
		create_title_and_vassal_change = {
			type = returned
			save_scope_as = change
			add_claim_on_loss = no
		}
		scope:neighbor_county = {
			change_title_holder = {
				holder = scope:neighbor
				change = scope:change
			}
		}
		resolve_title_and_vassal_change = scope:change
	}
	else = {
		create_title_and_vassal_change = {
			type = returned
			save_scope_as = change
			add_claim_on_loss = no
		}
		scope:neighbor_vassal = {
			change_liege = {
				liege = scope:neighbor
				change = scope:change
			}
		}
		resolve_title_and_vassal_change = scope:change
	}
	# Add xp
	scope:ruler = { add_diplomacy_lifestyle_xp = major_lifestyle_experience }
	# Add positive opinion
	scope:neighbor = {
		add_opinion = {
			modifier = respect_opinion
			target = scope:ruler
			opinion = low_positive_opinion
		}
	}
}

As written in game/common/scripted_effects/00_diplomacy_lifestyle_effects.txt.