H, I've been pulling my hair off as I can't get my nested collection working The idea is that the process first fetches an email, saves the attachment csv (Excel) and then starts processing them for queue. The first Excel sheet has information for collection1 and the second sheet for collection2. The collection1 has all the Fields named, and the last of them is a collection field where the collection2 should be added which I've tried with a calculation stage. Up untill that all goes well, but then the calculation gives error that the field is not found in collection1. That is the collection field which is named in Fields list. What am I doing wrong here? I don't get it... All help would be kindly apppreciated. Thank you