Allow to change XcmBridgeHubRouterByteFee by governance

parachains/runtimes/assets/asset-hub-kusama/Cargo.toml

@@ -148,6 +148,7 @@ try-runtime = [
 	"pallet-xcm/try-runtime",
 	"parachain-info/try-runtime",
 	"pallet-state-trie-migration/try-runtime",
+	"pallet-xcm-bridge-hub-router/try-runtime",
 ]
 std = [
 	"codec/std",

parachains/runtimes/assets/asset-hub-kusama/src/xcm_config.rs

@@ -200,6 +200,14 @@ impl Contains<RuntimeCall> for SafeCallFilter {
 			}
 		}
 
+		// Allow to change dedicated storage items (called by governance-like)
+		match call {
+			RuntimeCall::System(frame_system::Call::set_storage { items })
+				if items.iter().any(|(k, _)| k.eq(&bridging::XcmBridgeHubRouterByteFee::key())) =>
+				return true,
+			_ => (),
+		};
+
 		matches!(
 			call,
 			RuntimeCall::PolkadotXcm(pallet_xcm::Call::force_xcm_version { .. }) |
@@ -572,7 +580,9 @@ pub mod bridging {
 					.add_equals(AssetHubPolkadot::get().interior.split_global().expect("invalid configuration for AssetHubPolkadot").1),
 					// and nothing else
 				BridgeHubKusama::get(),
-				None
+				// base delivery fee to local `BridgeHub`
+				// (initially was calculated `170733333` + 10% by test `BridgeHubKusama::can_calculate_weight_for_paid_export_message_with_reserve_transfer`)
+				Some((XcmBridgeHubRouterFeeAssetId::get(), 187806666).into())
 			)
 		];
 

parachains/runtimes/assets/asset-hub-kusama/tests/tests.rs

@@ -778,3 +778,29 @@ fn xcm_reserve_transfer_filter_works() {
 			}
 		})
 }
+
+#[test]
+fn change_xcm_bridge_hub_router_byte_fee_by_governance_works() {
+	asset_test_utils::test_cases::change_storage_constant_by_governance_works::<
+		Runtime,
+		bridging::XcmBridgeHubRouterByteFee,
+		Balance,
+	>(
+		collator_session_keys(),
+		1000,
+		Box::new(|call| RuntimeCall::System(call).encode()),
+		|| {
+			(
+				bridging::XcmBridgeHubRouterByteFee::key().to_vec(),
+				bridging::XcmBridgeHubRouterByteFee::get(),
+			)
+		},
+		|old_value| {
+			if let Some(new_value) = old_value.checked_add(1) {
+				new_value
+			} else {
+				old_value.checked_sub(1).unwrap()
+			}
+		},
+	)
+}