Limitation of editable grid option set add remove options not working

function OnChangeField() {
    debugger;
    
    //get the selected rows - use the getControl method and pass the grid name.
    selectedRow = Xrm.Page.getControl("Fee").getGrid().getSelectedRows();

    //loop through rows and get the attribute collection
    selectedRow.forEach(function (row, rowIndex) {

        //get the attribute Collection
        attributeColl = row.getData().getEntity().attributes;

        //loop through attribute Collection and do the calculation and set the 
        attributeColl.forEach(function (att, attIndex) {

            switch (att.getName()) {
                case "stu_feetype":
                    //get the value of price
                    if (att.getValue() != null && att.getValue() != 'undefined') {


                        var optionSet = att;
                        var optionSetValues = att.getOptions();
                        optionSet.clearOptions();
                        for (i = 0 ; i < optionSetValues.length ; i++) {
                            if (optionSetValues[i].value == "956560000")
                                optionSet.addOption(optionSetValues[i]);
                            else
                                optionSet.removeOption(optionSetValues[i]);

                        }

                    }
                    break;
            }

        });
    });

}