As I illustrated to @amgo, I can now use the functionality developed after #1287, if we have multiple instances of more than one class in the row, it is not working. I attach example files. You need to navigate to the path data/GrowthRun/GrowthRunStep/purge/GasSource As you can see, the Bubblers class has two instances and the GasSource is supposed to have the same, but it is not [base_classes.schema.archive.yaml](/uploads/480c875cea02d58b25479d54f4ffc93b/base_classes.schema.archive.yaml) [Parma_datafile_nomad.xlsx](/uploads/a0d057fd5e06503c43e9591b39a50a0a/Parma_datafile_nomad.xlsx) [test.schema.archive.yaml](/uploads/ad3e273d9a890c9fcbe6f0b0069d63c4/test.schema.archive.yaml)