Thanks @Dat, unfortunately the delay did not help. The macro gets store locations from an external API, stores it in an ArrayList, and on the frontend, I would like to display the data points in alphabetical groupings - thus using the hierarchical transformations and universal repeater. I've done similar things before successfully, but only when it's a custom query (Universal viewer with custom query). Seems like using a custom macro data source loses some of the mapping magic?
@Roman: did you forget to include some links?