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...