Hello sunil, 

Thank you for posting in our forum. 

You can apply custom validation logic by setting a custom validation function, for more details on the custom validation function please refer to:

http://www.igniteui.com/help/api/2016.1/ui.igvalidator#options:custom

 And you can show a custom message by canceling the errorShowing event of the validator and manually creating and showing  a igNotifier for the last row.
I’ve attached an example for your reference where a value from the "2015" column is edited and validation fails a new igNotifier is created and shown on the last cell from the last column.

Please refer to the attached sample and let me know if you have any questions.

Best Regards,

Maya Kirova

Infragistics, Inc.

http://www.infragistics.com/support

I suggest you handle the editCellEnded event of the Updating feature and manually create and show an igNotifier with the custom message based on your custom logic.

For example:

editCellEnded: function(e, ui){

                   if(ui.columnKey === "2015"){         

                        //apply custom logic for checking if values are correct

                        //show notifier on last row

                        var lastCell = $("#grid > tbody > tr:last").find("td").eq(1);

                        if(lastCell.data("igNotifier")){

                             lastCell.data("igNotifier").show();

                        }else{

                             lastCell.igNotifier({                                             

                             mode:"popover",

                              state: "error",

                             messages: {

                                 error: "Total Volume not matched!"

                             }

                             });

                        }

                        return false;

                   }

              }

Let me know if you have any questions.