I have reproduced the issue and decided to forward it to our developers. We will update this ticket once we have any progress on this.
Web Report Designer - It is not possible to specify the Series.SummaryFunction property value for the XRChart control
Answers approved by DevExpress Support
We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.
Note: Hotfixes may be unavailable for beta versions and updates that are about to be released.
- v15.2.4Download Official Update
- v15.1.8Download Official Update