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    $\begingroup$ I don't fully understand your problem, but I think you suffer from some misunderstanding about what Module and especially Print do: Print will print its argument to the notebook but return Null, and most errors you see are due to that. Module with an empty list of local variables is a noop, so you could just remove it without any change in what the code does... $\endgroup$ Commented Mar 27, 2017 at 10:46
  • $\begingroup$ Removing Print[] and Module[] has no effect. I removed them above for clarity. (Also removed a typo semicolon that was causing a Null output, thanks.) $\endgroup$ Commented Mar 27, 2017 at 14:21
  • $\begingroup$ So what is your goal: do you want to append assoc1 to both datasets as shown as a list? $\endgroup$ Commented Mar 27, 2017 at 14:30
  • $\begingroup$ In my actual code project, the nested Modules are serving a purpose, localizing the scope of other calculations. Removing them entirely makes everything work, but my question is about why they won't work in this case. $\endgroup$ Commented Mar 27, 2017 at 14:30
  • $\begingroup$ @gwr Yes, I'd like to operate locally on the entries of each dataset - appending the association to the existing dataset is the most basic example I could think of. $\endgroup$ Commented Mar 27, 2017 at 14:33