How to add Reference selector to an attribute?

when I add an attribute to a page, it is not getting the reference selector. but for those attributes which are added automatically when overview pages are generated, they got reference selector.
1 answers

Hi Akash,

Reference selector is used to select the value of a one-to-one or one-to-many association by selecting the associated object.

So when you place a reference selector in dataview, the object retrieved by this data widget must be at the many end of a one-to-many association, or at either end of a one-to-one association.

For more refer this,