"Add Function Import" window shows "Not Support" for the EDM type column and empty for Db type column

I have used Entiry data model wizard to create a entity model for the stored procedure. Entity Model created successfully.
Then I imported the stored procedure as per instruction mentioned in MSDN.

And when I clicked on the "Get Column Information" button of "Add Function Import" window. I am getting "Not supported" for EDM type and empty for Db type column.

I have used DB2.Net Visual Studio Adds tools to create stored procedure. Later I am using that stored procedure to create Entity Model as mentioned above.

Could you please let me know why I am getting "Not Supported" for EDM type and empty for Db type column.

Thanks,