PrePopulate a Node URL from Previous Node via Rules Link to Add Content Form
You need to have an entity reference field in your form and set it to reference nodes. 

Normally, you would then build your link with the current node's Nid to fill the entity reference field on the next page.

http://example.com/node/add/article?field_previous_page=123


However, because you are using rules link, I guess you have to create a redirect to the form based on the current node replacement pattern available.

Or below is a solution if that doesn't work out.


  If you really must use rules link and can't get normal methods to work, then Rules Session Variables
  would be an easy solution. It will give you actions to let you add the
  node's id into $_session.
  
  Then when you the user saves the form, have another rule that 
  checks if $_session exists and if so, take the Nid, fetch the node and then
  set the entity reference field with it.


So yeah, do you need to use rules link?