SCMQuoteParityEntry data = null;                      data=   scmConetxt.SCMQuoteParityEntry.Where(i => i.Id == id).SingleOrDefault();                      SCMQuoteParity scm = new SCMQuoteParity() { Id=Convert.ToInt32( data.SCMQuoteParityId)};                     scmConetxt.SCMQuoteParity.Remove(scm);                     scmConetxt.SCMQuoteParityEntry.Remove(scmConetxt.SCMQuoteParityEntry.Find(id));                     scmConetxt.SaveChanges();代碼如上，我想點擊刪除同時刪掉兩個表里的數據，兩個表有字段關聯。上面的代碼報錯 The object cannot be deleted because it was not found in the ObjectStateManager.小白求救沒怎么接觸過ef