If The trail has a crucial into a navigation house, the motion must have a parameter named relatedKey. general public class Client general public int CustomerId get; set; // structural home, primitive type, essential community Handle Site get; established; // structural residence, intricate kind public IList Orders get; set; // https://kingswoodhomes.uk.com/news/kingswood-homes-site-manager-swaps-site-boots-for-dancing-shoes/