Hi Markus,
Indeed, this is the recommended way to remedy the issue.
The problem is explained in the Telerik AJAX documentation. Please refer to jQuery Troubleshooting, e.g.
You can avoid jQuery and validation problems with a single line in the web.config that will disable the Unobtrusive Validation.
**web.config**
<appSettings>
<add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>
Best Regards,
Rumen
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