diff --git a/precompiles/pallet-xcm/XcmInterface.sol b/precompiles/pallet-xcm/XcmInterface.sol
index d657a2b9..96638aae 100644
--- a/precompiles/pallet-xcm/XcmInterface.sol
+++ b/precompiles/pallet-xcm/XcmInterface.sol
@@ -41,6 +41,20 @@ interface XCM {
     /// @param dest The destination chain.
     /// @param beneficiary The actual account that will receive the tokens on dest.
     /// @param assets The combination (array) of assets to send in Location format.
+    /// Assets MUST be sorted, otherwise there may be discrepancies with the feeAssetItem.
+    ///
+    /// Example a) of sorted assets (native asset and para 1000 asset):
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
+    /// Example b) of sorted assets: (native asset and relay asset)
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: Here}
+    ///
+    /// Example c) of sorted assets: (relay asset and para 1000 asset)
+    ///     1st - Location { parents: 1, interior: Here}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
     /// @param feeAssetItem The index of the asset that will be used to pay for fees.
     function transferAssetsLocation(
         Location memory dest,
@@ -55,6 +69,20 @@ interface XCM {
     /// @param paraId The para-id of the destination chain.
     /// @param beneficiary The actual account that will receive the tokens on paraId destination.
     /// @param assets The combination (array) of assets to send in Address format.
+    /// Assets MUST be sorted, otherwise there may be discrepancies with the feeAssetItem.
+    ///
+    /// Example a) of sorted assets (native asset and para 1000 asset):
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
+    /// Example b) of sorted assets: (native asset and relay asset)
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: Here}
+    ///
+    /// Example c) of sorted assets: (relay asset and para 1000 asset)
+    ///     1st - Location { parents: 1, interior: Here}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
     /// @param feeAssetItem The index of the asset that will be used to pay for fees.
     function transferAssetsToPara20(
         uint32 paraId,
@@ -69,6 +97,20 @@ interface XCM {
     /// @param paraId The para-id of the destination chain.
     /// @param beneficiary The actual account that will receive the tokens on paraId destination.
     /// @param assets The combination (array) of assets to send in Address format.
+    /// Assets MUST be sorted, otherwise there may be discrepancies with the feeAssetItem.
+    ///
+    /// Example a) of sorted assets (native asset and para 1000 asset):
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
+    /// Example b) of sorted assets: (native asset and relay asset)
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: Here}
+    ///
+    /// Example c) of sorted assets: (relay asset and para 1000 asset)
+    ///     1st - Location { parents: 1, interior: Here}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
     /// @param feeAssetItem The index of the asset that will be used to pay for fees.
     function transferAssetsToPara32(
         uint32 paraId,
@@ -82,6 +124,20 @@ interface XCM {
     /// @custom:selector 6521cc2c
     /// @param beneficiary The actual account that will receive the tokens on the relay chain.
     /// @param assets The combination (array) of assets to send in Address format.
+    /// Assets MUST be sorted, otherwise there may be discrepancies with the feeAssetItem.
+    ///
+    /// Example a) of sorted assets (native asset and para 1000 asset):
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
+    /// Example b) of sorted assets: (native asset and relay asset)
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: Here}
+    ///
+    /// Example c) of sorted assets: (relay asset and para 1000 asset)
+    ///     1st - Location { parents: 1, interior: Here}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
     /// @param feeAssetItem The index of the asset that will be used to pay for fees.
     function transferAssetsToRelay(
         bytes32 beneficiary,
@@ -97,6 +153,20 @@ interface XCM {
     /// @custom:selector 8425d893
     /// @param dest The destination chain.
     /// @param assets The combination (array) of assets to send in Location format.
+    /// Assets MUST be sorted, otherwise there may be discrepancies with the remoteFeesIdIndex.
+    ///
+    /// Example a) of sorted assets (native asset and para 1000 asset):
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
+    /// Example b) of sorted assets: (native asset and relay asset)
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: Here}
+    ///
+    /// Example c) of sorted assets: (relay asset and para 1000 asset)
+    ///     1st - Location { parents: 1, interior: Here}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///  
     /// @param assetsTransferType The TransferType corresponding to assets being sent.
     /// @param remoteFeesIdIndex The index of the asset (inside assets array) to use as fees.
     /// @param feesTransferType The TransferType corresponding to the asset used as fees.
@@ -115,6 +185,20 @@ interface XCM {
     /// @custom:selector fc19376c
     /// @param dest The destination chain.
     /// @param assets The combination (array) of assets to send in Location format.
+    /// Assets MUST be sorted, otherwise there may be discrepancies with the remoteFeesIdIndex.
+    ///
+    /// Example a) of sorted assets (native asset and para 1000 asset):
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
+    /// Example b) of sorted assets: (native asset and relay asset)
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: Here}
+    ///
+    /// Example c) of sorted assets: (relay asset and para 1000 asset)
+    ///     1st - Location { parents: 1, interior: Here}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
     /// @param remoteFeesIdIndex The index of the asset (inside assets array) to use as fees.
     /// @param customXcmOnDest The XCM message to execute on destination chain (SCALE encoded).
     /// @param remoteReserve The remote reserve corresponding for assets and fees. They MUST
@@ -135,6 +219,20 @@ interface XCM {
     /// @custom:selector 998093ee
     /// @param dest The destination chain.
     /// @param assets The combination (array) of assets to send in Address format.
+    /// Assets MUST be sorted, otherwise there may be discrepancies with the remoteFeesIdIndex.
+    ///
+    /// Example a) of sorted assets (native asset and para 1000 asset):
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
+    /// Example b) of sorted assets: (native asset and relay asset)
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: Here}
+    ///
+    /// Example c) of sorted assets: (relay asset and para 1000 asset)
+    ///     1st - Location { parents: 1, interior: Here}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
     /// @param assetsTransferType The TransferType corresponding to assets being sent.
     /// @param remoteFeesIdIndex The index of the asset (inside assets array) to use as fees.
     /// @param feesTransferType The TransferType corresponding to the asset used as fees.
@@ -153,6 +251,20 @@ interface XCM {
     /// @custom:selector aaecfc62
     /// @param dest The destination chain.
     /// @param assets The combination (array) of assets to send in Address format.
+    /// Assets MUST be sorted, otherwise there may be discrepancies with the remoteFeesIdIndex.
+    ///
+    /// Example a) of sorted assets (native asset and para 1000 asset):
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
+    /// Example b) of sorted assets: (native asset and relay asset)
+    ///     1st - Location { parents: 0, interior: [PalletInstance(3)]}
+    ///     2nd - Location { parents: 1, interior: Here}
+    ///
+    /// Example c) of sorted assets: (relay asset and para 1000 asset)
+    ///     1st - Location { parents: 1, interior: Here}
+    ///     2nd - Location { parents: 1, interior: [Parachain(1000), PalletInstance(3)]}
+    ///
     /// @param remoteFeesIdIndex The index of the asset (inside assets array) to use as fees.
     /// @param customXcmOnDest The XCM message to execute on destination chain (SCALE encoded).
     /// @param remoteReserve The remote reserve corresponding for assets and fees. They MUST