Error During Update Records using Entity Framework

Today I encountered an error during update records using Entity Framework. Fortunately we found a quick fix.
 
 This is an error we encountered:
 
 Unable to update the EntitySet Table because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation
 
 In this quick post you are going learn the way to overcome the titled error.
 
 Fix for an issue as shown below:
 
 Simple solution to this error is to create database tables with primary keys.
 
 Simple to fix.