Answer given in the comments of the original post: Jay-Evolytics
19-05-2020 Hey mattb, a little later here, but my bet is that Launch
just doesn't accept this valid notation through it's GUI. Out of
curiosity though, is your Data Layer coming from the "Blend" mortgage
application? That syntax is identical to what they use ... mattb89502451
19-05-2020 Thanks Jay. You got it - dataLayer stemming from the Blend
mortgage app. For now, we're just going the custom code route. Seems
silly that we can...