Conditional sum of integers from nested repeat groups

Hi KoBoToolbox community. Hoping someone can help me with this.

With reference to the attached screenshot, I am trying to sum up the total pieces for each fruit bought from different purchase (i.e., purchase period or purchase channel). For this, I initially created a repeat group (purchases) within another repeat group (pieces), but I am having a difficulty in doing the sum portion given the challenge coming from the undefined repeat loops and options in the select-multiple question.

Welcome to the community, @hm11! Maybe this post discussed previously should help you solve your issue:

hi @Kal_Lam , thank you for your response. however, I think this example only works with single select question type. in my case, it is multiple select and I am currently working on extracting on the pieces input per fruit for the summation. I have tried combining skip logic for multiple select and indexed-repeat so far, but it’s still not working. for your further assistance please

Hi @hm11 ,
I came across your post and I was wondering whether you found a workaround that solved the issue?
I think I am facing the same, I have a multiple select in the beginning of a repeat group and I have difficulties to calculate the sum. Based on what was described in this post, I managed to make it work as long as all options of the multiple-select are selected, in each loop. But this will rarely be the case.
Hi @Kal_Lam, is there no way around this when including a multiple-select?

Here is a screenshot of my example, various student groups are entered with details on the number of boys and girls in a group. (it only shows a reduced selection of fields and options for the select-multiple. In the original more details need to be filled in that make both the multiple-select and loop necessary)

hi @Frieda, here’s a screenshot on what worked for me. I hope this helps.

Hi @hm11, thanks for your reply. I will have a look at your solution.