    // Whitelisted proposal callers. The proposal caller is the contract that calls the `InterchainProposalSender` at the source chain.
    mapping(string => mapping(address => bool)) public whitelistedCallers;

    // Whitelisted proposal senders. The proposal sender is the `InterchainProposalSender` contract address at the source chain.
    mapping(string => mapping(address => bool)) public whitelistedSenders;

    ...

    /**
     * @dev Set the proposal caller whitelist status
     * @param sourceChain The source chain
     * @param sourceCaller The source caller
     * @param whitelisted The whitelist status
     */
    function setWhitelistedProposalCaller(
        string calldata sourceChain,
        address sourceCaller,
        bool whitelisted
    ) external override onlyOwner {
        whitelistedCallers[sourceChain][sourceCaller] = whitelisted;
        emit WhitelistedProposalCallerSet(sourceChain, sourceCaller, whitelisted);
    }

    /**
     * @dev Set the proposal sender whitelist status
     * @param sourceChain The source chain
     * @param sourceSender The source sender
     * @param whitelisted The whitelist status
     */
    function setWhitelistedProposalSender(
        string calldata sourceChain,
        address sourceSender,
        bool whitelisted
    ) external override onlyOwner {
        whitelistedSenders[sourceChain][sourceSender] = whitelisted;
        emit WhitelistedProposalSenderSet(sourceChain, sourceSender, whitelisted);
    }
    // Whitelisted proposal callers. The proposal caller is the contract that calls the `InterchainProposalSender` at the source chain.
-   mapping(string => mapping(address => bool)) public whitelistedCallers;
+   mapping(string => mapping(string => bool)) public whitelistedCallers;

    // Whitelisted proposal senders. The proposal sender is the `InterchainProposalSender` contract address at the source chain.
-    mapping(string => mapping(address => bool)) public whitelistedSenders;
+    mapping(string => mapping(string => bool)) public whitelistedSenders;
