Update XCM MultiLocation prefixes for assets (#831)

polkadot-parachains/westmint/src/lib.rs

@@ -43,7 +43,7 @@ use codec::{Decode, Encode, MaxEncodedLen};
 use constants::{currency::*, fee::WeightToFee};
 use frame_support::{
 	construct_runtime, match_type, parameter_types,
-	traits::{Everything, InstanceFilter},
+	traits::{Everything, InstanceFilter, PalletInfoAccess},
 	weights::{
 		constants::{BlockExecutionWeight, ExtrinsicBaseWeight},
 		DispatchClass, IdentityFee, Weight,
@@ -430,6 +430,8 @@ parameter_types! {
 	pub RelayChainOrigin: Origin = cumulus_pallet_xcm::Origin::Relay.into();
 	pub Ancestry: MultiLocation = Parachain(ParachainInfo::parachain_id().into()).into();
 	pub const Local: MultiLocation = Here.into();
+	pub AssetsPalletLocation: MultiLocation =
+		PalletInstance(<Assets as PalletInfoAccess>::index() as u8).into();
 	pub CheckingAccount: AccountId = PolkadotXcm::check_account();
 }
 
@@ -467,7 +469,7 @@ pub type FungiblesTransactor = FungiblesAdapter<
 	ConvertedConcreteAssetId<
 		AssetId,
 		Balance,
-		AsPrefixedGeneralIndex<Local, AssetId, JustTry>,
+		AsPrefixedGeneralIndex<AssetsPalletLocation, AssetId, JustTry>,
 		JustTry,
 	>,
 	// Convert an XCM MultiLocation into a local account id: