    function unlinkAddress(address _linkedAddress) external {
        address _linkedTo = linkedAddresses[_linkedAddress].masterAddress;
        require(_linkedTo != address(0), 'V:UA-Address not linked');
        require(_linkedTo == msg.sender, 'V:UA-Not linked to sender');
        delete linkedAddresses[_linkedAddress]; 
       ...
}
    function linkAddress(address _masterAddress) external {
        require(linkedAddresses[msg.sender].masterAddress == address(0), 'V:LA-Address already linked');   // == true (after unlinkAddress)
        require(pendingLinkAddresses[msg.sender][_masterAddress], 'V:LA-No pending request');                 // == true (after unlinkAddress)
        _linkAddress(msg.sender, _masterAddress);                                                                                           // // pendingLinkAddresses not reset
    }

function cancelAddressLinkingRequest(address _linkedAddress) external {
        ... 
        delete pendingLinkAddresses[_linkedAddress][msg.sender]; // only location where pendingLinkAddresses is reset
delete pendingLinkAddresses[msg.sender][_masterAddress]; 
