I have the same issue @Kal_Lam , The examples that you posted are all within the same group. In the Round 2 file you have only one group “C_Demographic” that also contains the ID “C_SN”. When you add a second group and copy the calculation and try to use “C_SN” in the same way, it does not work. I couldn’t find an explanation about the syntax behind the instance function and how to navigate different groups within the same child survey. All links I found are linking back to this article and this post both lacking a solution. Only having the entire example based on a single group. Thanks for any help.
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