#xcm Trying to encode native token as Here fails with AssetHasNoReserve in XToken transfer

[dzmitry-lahoda]

If I encode my native token as (1, para id, general key) XTokens can send it to other chain.

If I encode my native token as (0, here) XTokens fails to send it to other chain with AssetHasNoReserve on sender side (so XCM never send and tx fails - so it is not receiver chain issue).

Parity pallet-xcm sends (0,here) encoded token and other chain reseives..

I try to encode as (0, Here) as I see that is common locally to encode (0, here) so it is transformed by executor and reaches other chain as (1, para id)

[dzmitry-lahoda]

Also I see weird with non native. Like it is gated somehow and I get NotCrossChainTransferableCurrency . Also It can be encoded into Origin ok. Because RelayerXcm::limited_reserve_transfer_assets sends fine.

So same configuration of XCM, some possibly valid imho configs work with RelayerXcm, but no XTokens.

[dzmitry-lahoda]

I could have made some misconfiguration of xTokens, not sure what so :(

[shaunxw]

It looks to me that you misconfigured xtokens. It might be the SelfLocation and ReserveProvider in your config is not consistent. If either of them is configured with interpreting locations as relative view(with Here junction), the other one should be relative as well. You may refer to this config in unit tests mock as an example:

open-runtime-module-library/xtokens/src/mock/para_relative_view.rs

Lines 319 to 334 in 2c48b62

	impl orml_xtokens::Config for Runtime {
	type Event = Event;
	type Balance = Balance;
	type CurrencyId = CurrencyId;
	type CurrencyIdConvert = RelativeCurrencyIdConvert;
	type AccountIdToMultiLocation = AccountIdToMultiLocation;
	type SelfLocation = SelfLocation;
	type MultiLocationsFilter = ParentOrParachains;
	type MinXcmFee = ParachainMinFee;
	type XcmExecutor = XcmExecutor<XcmConfig>;
	type Weigher = FixedWeightBounds<ConstU64<10>, Call, ConstU32<100>>;
	type BaseXcmWeight = ConstU64<100_000_000>;
	type LocationInverter = LocationInverter<Ancestry>;
	type MaxAssetsForTransfer = MaxAssetsForTransfer;
	type ReserveProvider = RelativeReserveProvider;
	}

As for NotCrossChainTransferableCurrency error, it raises if you don't config the MultiLocation for the currency to transfer in CurrencyIdConvert.