Hello, everyone!
I have here a select_multiple question type (Activities) and decimal question type (Amount). The requirement is, if the user forgot to select "Shopping" from the Activities question and filled out an amount in the Amount question, that is, if Amount > 0, the "Shopping" choice in the Activities question should automatically be checked.
My XLS form looks like this (Please see Figure 1). This is just a part of a long survey form. The "Shopping" choice is automatically selected if Amount > 0. However, my calculation will automatically clear out all other choices selected by the user in the Activities question and only checks the "Shopping" option (Please see Figure 2).
Figure 1

Figure 2

The requirement is to keep all choices selected by the user in the Activities select multiple question type then if the user forgot to select the "Shopping" option, it will automatically be selected also if the an amount > 0 is entered in the Amount decimal question type. I have also attached my XLS Form for reference.
Thank you in advance for any hint or suggestions.