data grid column

Hi , I am using one Entity using generalization with System.file document for taking file from User also creates 5 attributes in Same Entity under My module domain model. but when I tried to generate overview page for the selected entity it generates both attributes( System.FileDocument  entity and my own Entity attributes) in overview page data grid but problem occoured when try to pass the attribute in overview page ,creating 2 new lines for the same objects. Now      . File Document Entity  
1 answers

What entity is the datagrid pointing to?