Have you tried using an Xpath constraint? Something like this (you should adapt it to your domain model set-up)?
[Order_Customer/Customer/User_Customer/User = '[%CurrentUser%]']
Or you could call a microflow on the button, then first do a retrieve of what you need exactly, and give that object to a the modal pup-up page you want to display.
Hope this helps.
Thanks for the response. Can you clarify what you mean by giving the object to the modal pop-up page? Do you mean returning an object from the microflow? The microflow I’m envisioning would just have a Retrieve action only, correct?