Prefilled data for reference selector

Hi all, I would like to know if it's possible to have a reference selector be prefilled. For instance: I have a customer and I want to add a newsletter registration to that customer. Can I have the customer be prefilled in the reference selector, so that I don't have to select the customer again on this page (as a user)? I have to select the customer in this particular case first, before I can save.  I see it working in some pages...but those are the pages that I generated from a create button.    
1 answers

Before redirecting the page, in a microflow you could set the association between NewsLetter and required Customer.