Hi Biljana,
We have checked the reported issue “Binding for CheckedItems property is not working when SfTreeView is placed within the DataTemplate” on our end and it is confirmed as a defect. And We have logged a bug. We will include this fix in our NuGet release which is scheduled on January 10, 2023.
You can track the status of this report through the following feedback link,
Feedback Link: https://www.syncfusion.com/feedback/39971/binding-for-checkeditems-property-is-not-working-when-sftreeview-is-placed-within
Note: The provided feedback link is private, and you need to log in to view this feedback.
We appreciate your patience until then.