Issue saving data to BO

Summary:

While trying to Save Data to a BO using SDP . It is saving as 0 1 2 3 etc.

The Field Name is Emp_Dept_Name which has data like 'HR', IT ', etc.

It is selected though Select Single LOV . While trying to save the data as HR , it is getting saved as 0 , then on entering the

Emp_Dept_Name again for another Record as HR it is saving as 1 and for third Record is is saving as 3 and so on instead of saving it as HR, IT etc.

Please advise if it is some issue with Id / index in the BO and how to fix this.