Use the example at http://demos.telerik.com/kendo-ui/grid/editing-custom.
To reproduce the issue:
- Click Add new record once
- Click Add new record a second time: a validation message is displayed
- Click Delete on any other record: validation is no more enforced and you get a bad record
- Click Add new record a third time, a new record is added although a previous record is invalid
How to properly enforce validation is this example?