Columns from ShoppingcartItem table are bot visible in request property parameters

Hi All,

I have created custom table and extended shoppingcartitem table with one column with foreign key to custom table.

Now I want to define request property but while adding parameters to request property I can not see custom column which I added on ShoppingcartItem.

Do you have any idea why this column is not available there. 

There are some other custom columns and I can see then in dropdown.

You can see some screen prints at below location.

https://1drv.ms/u/s!At2ViqLAc9Hpga92CadmKhkMjhCf2Q?e=NrEhLS 

Thank you in advance.

Kind Regards,

Dnyandev