view an element from a query

Thanks a lot for your advice. Can you help me also about this problem?
I have a list with 3 elements. One of these is a databasejoin plug-in type. In the options I want to use, like "Render join as" checkbox. Everything works but when I submit no data is stored in the list, while if I use for example (like "Render join as") "multi select dropdown" all data are stored. I'd like to use checkbox to select the data because is more simple. Do you have an advice to solve my problem please
 
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