There are two options in this case:
1) On the onItemChange event of the Grid, check if the value written in the numeric field is less then 0 and if it is, do not change the state.
2) Use a custom NumericTextBox editor in the Grid and set its min value to 0:
- https://www.telerik.com/kendo-react-ui/components/grid/editing/editing-custom/ - custom editor
- https://www.telerik.com/kendo-react-ui/components/inputs/api/NumericTextBoxProps/#toc-min - min value.
I hope one of these two approaches proves helpful.
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