pub type Barrier = TrailingSetTopicAsId<
	DenyThenTry<
		DenyReserveTransferToRelayChain,
		(
			// Allow local users to buy weight credit.
			TakeWeightCredit,
			// Expected responses are OK.
			AllowKnownQueryResponses<PolkadotXcm>,
			WithComputedOrigin<
				(
					// If the message is one that immediately attempts to pay for execution, then
					// allow it.
					AllowTopLevelPaidExecutionFrom<Everything>,
					// Parent, its pluralities (i.e. governance bodies), relay treasury pallet
					// and sibling People get free execution.
					AllowExplicitUnpaidExecutionFrom<(
						ParentOrParentsPlurality,
						Equals<RelayTreasuryLocation>,
						Equals<SiblingPeople>,
					)>,
					// Subscriptions for version tracking are OK.
					AllowSubscriptionsFrom<ParentRelayOrSiblingParachains>,
					// HRMP notifications from the relay chain are OK.
					AllowHrmpNotificationsFromRelayChain,
				),
				UniversalLocation,
				ConstU32<8>,
			>,
		),
	>,
>;