Hello Kundan,
I worked around your scenario and got that if you are give Auto number no to your Entity Identifier (if you are using default Long Integer or integer) then this error come
check Entity identifier if set NO then if not then set to yes this error will gone.

If you used data type of different entity as ID then this field automatically gone for below scenario its not problem so please above scenario.
In your case you send this kind of Screenshot but there is not a problem problem occurred from different entity

Hope this will helps you.
Thanks and Regards,
Akshay Deshpande