error 3021 when adding scalar property <p>I have an error below after I add Scalar property on EDMX.</p> <p><a href="https://i.stack.imgur.com/iPzW3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iPzW3.png" alt="enter image description here"></a></p> <p>kindly help. thanks.</p> <p>Error 4 Error 3021: Problem in Mapping Fragment starting at line 13750: Each of the following columns in table SystemUserDetails is mapped to multiple conceptual side properties: SystemUserDetails.COM_ID is mapped to </p> <pre><code>C:\Users\User\Desktop\New folder\CustCare with Frontliner System\RevTrackDAL\RevTrackModel2.0.edmx 13751 11 RevTrackDAL </code></pre>