The Detailed description In:
https://github.com/telerik/kendo-ui-core/issues/3903


Bug report
Currently, DataSource bound Spreadsheet throws "Unsupported for multiple ranges" error when attempting to delete the content from multiple not adjusted cells.

The error is thrown by the values() method:

values: function (values) {
    if (this._ref instanceof UnionRef) {
        throw new Error('Unsupported for multiple ranges.');
    }
    if (this._ref === kendo.spreadsheet.NULLREF) {
....
Reproduction of the problem
Go to the DataSource Binding demo;
Select a few cells using the Ctrl + click;
Press Delete button on the keyboard;
"Unsupported for multiple ranges" error will be thrown from the values() method;

This bug has not been resolved in Version 2018.3.911.