I slightly modified following example: http://www.telerik.com/kendo-angular-ui/components/grid/excel-export/#toc-exporting-specific-data
I just added "sum" aggregate to "ProductID" field. It works fine in the grid. But when I try to save the grid as an excel file, I loose that aggregate. Though the excel file contains grouped data.
Here is a plunker to reproduce: http://plnkr.co/edit/ej4yEj2wZO0RoHXlzqGF?p=preview
Could someone help me to fix that plunker, please?