Property ‘field’ on type ‘Microsoft.Dynamics.CRM.entity’ is not a navigation property or complex property. Only navigation properties can be expanded

This is a common error message when you are trying to use multi-type lookup fields(i.e regardingobjectid, customerid, activityid) in odata requests to expand(join) entities. It basically says the lookup field you are expanding to does not have a navigation property for that entity. You just need to tell the web api which entity you are … Continue reading Property ‘field’ on type ‘Microsoft.Dynamics.CRM.entity’ is not a navigation property or complex property. Only navigation properties can be expanded