EntityFramework Insert error due to PrimaryKey

MyProject.Controllers.CurrencyCodesController Unable to update the EntitySet 'CurrencyCodes' because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation. System.Data.Entity.Infrastructure.DbUpdateException: Unable to update the EntitySet 'CurrencyCodes' because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation. ---> System.Data.Entity.Core.UpdateException: Unable to update the EntitySet 'CurrencyCodes' because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation.

​ Scenario:  The error occured while trying to insert the currencycodes entity to the database.  [HttpPost] [ValidateAntiForgeryToken] public ActionResult Create([Bind(Include = "cucCurrencyCode,cucDescription,cucMultiplier,cucRate,cucInUse")] CurrencyCode currencyCode) { if (ModelState.IsValid) { try { db.CurrencyCodes.Add(currencyCode); db.SaveChanges(); } catch (Exception ex) { log.Error(ex.Message, ex); } return RedirectToAction("Index"); } return View(currencyCode); } Solution:  1) Check Primary key in .edmx file.  In my case cucInUse was set as Entity key. I removed it. 2) Now Right click the .edmx file and click "Open with...". Select XML (text) Editor 3)  Find the element <EntitySet name = "CurrencyCodes"...> 4) Change store:Schema="dbo" => Schema="dbo" 5) delete element <DefiningQuery> 6) Clean the project.  7) close Visual studio. 8) Open visual studio. Open the project.  9) Clean and build the project.  10) Run the application.