If you are looking to access the data that you passed to the “Collection” form, you will find it under properties in the init method (e.g., properties['item']['Name'])
For example:
class Collection(CollectionTemplate):
def __init__(self, **properties):
# Set Form properties and Data Bindings.
self.init_components(**properties)
print(properties['item']['Name']) # here is the data you passed along when you opened this form
.
.
.
Also, in general, when you are inside a RepeatingPanel’s ItemTemplate, there are various ways of reaching back to the “outside” (i.e., parent forms). Perhaps the discussions below can help explain a few approaches.