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Understood.  If you're using dynamic forms then the collections won't work for you.  The collection will only "see" the first instance of the subform.  You will need to do something like in this sample: http://my.adobe.acrobat.com/p52549088/.

This sample shows you how to manually encode data into your barcode from a subform that repeats.  Ideally you would not use XML or any special characters in your data but this worked well for demonstration purposes.