I hope you can help me out.
I have the element Recipient that contains another 2 nested Elements Contact and LetterWindow
I am trying to populate line1 through to line3 of Letterwindow using the data from Contact (firstname, lastname)
I have tried
concat(field('Recipient.Contact.firstname'),' ',field('Recipient.Contact.lastname')) without success
What do I need to change so this works? Or is this not possible currently?