BDC (External Content Type), CRUD Operation for associated table

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SharePoint

I have created below two BDC list in sharepoint designer 2010.

1. Department
      Id              Int (Promary Key)
      DeparmentName   varchar(25)

2. Employee
      Id              Int (Promary Key)
      EmployeeName    Varchar(50)
      DepartmentId    Int (Foreign key to Deparment table Id)

Independently both list are working fine. When I perform CRUD (Create, Read, Upadate, Delete) operation on Employee it shows me DepartmentId, I want convert it into DeparmentName, how can I achieve this?

Thanks in advance