AgShiftNameValue {
id: dlvyGrossContainer
objectName: "dlvyGrossContainer"

                    itemHeight: getItemHeight()

                    name: qsTr("Dlvy Gross wt")
                    isEnabled: isCheckerboardValid()
                    valueType: "Float"
                    placeValue:   "Tap & Enter"
                    value: root.inspectionGrossWeight
                    valueState: root.inspectionGrossWeight ? "Selected" : "Empty"
                    clickPopup: numericKeypad
                    keypadAlignment: TextInput.AlignTop

                    mandatory: (root.inspectionGrossWeight == "") ? true : false
                    visible: !showVarietyWeightPanel() && isWeightVisible()
                    styleSheet: valuesModel._styleSheet
                    sectionConfig: valuesModel.sectionConfig



                    function isWeightVisible() {
                        var m = JSON.parse(Settings.commodities)
                        return root.commodity && root.commodity.length && m[root.commodity.toLowerCase()]["measuredByWeight"]
                               && !(Session.inspection_type === "training")
                    }

                    function initialize() {
                        valueState = root.inspectionGrossWeight ? "Selected" : "Empty"
                    }

                    onValueChanged:{
                          console.debug(logObj.pageAction,Settings.GROSS_WEIGHT_MAX_THRESHOLD   +" dekho kya aaya hai")

                        if (Number(root.inspectionGrossWeight) >= Settings.GROSS_WEIGHT_MAX_THRESHOLD || Number(root.inspectionGrossWeight) < Settings.GROSS_WEIGHT_MIN_THRESHOLD) {
                            notifygrossText.show("Dlvy Gross wt should be greater than or equal to 1 and less than "+ Settings.GROSS_WEIGHT_MAX_THRESHOLD)
                        } else {
                            notifygrossText.hide()
                        }
                        if(!isEmptyVal(root.inspectionGrossWeight) && root.inspectionTareWeight !== 0){
                            (Number(root.inspectionTareWeight) >= Number(root.inspectionGrossWeight)) ? notifytareText.show("Dlvy Tare wt should be less than Dlvy Gross weight") : notifytareText.hide()
                        }
                    }

                    onSelectionChanged: {
                        root.inspectionGrossWeight = newItem
                    }
                }


                Text {
                    id: notifytareText
                    visible: false
                    width: 300
                    leftPadding: 20
                    anchors.top: dlvyTareContainer.bottom
                    anchors.horizontalCenter: parent.horizontalCenter
                    color: "black"
                    font.pointSize: 12
                    font.family: "Ubuntu"

                    function show(message) {
                        text = message
                        visible = true
                    }

                    function hide() {
                        visible = false
                        text = ""
                    }
                }

                AgShiftNameValue {
                    id: dlvyTareContainer
                    objectName: "dlvyTareContainer"

                    itemHeight: getItemHeight()

                    name: qsTr("Dlvy Tare wt")
                    isEnabled: isCheckerboardValid()
                    valueType: "Float"
                    placeValue: "Tap & Enter"
                    value: root.inspectionTareWeight // ? root.inspectionTareWeight : "0"
                    valueState: root.inspectionTareWeight ? "Selected" : "Empty"
                    clickPopup: numericKeypad
                    keypadAlignment: TextInput.AlignTop
                    mandatory: initialize()
                    visible: !showVarietyWeightPanel() && isWeightVisible()
                    styleSheet: valuesModel._styleSheet
                    sectionConfig: valuesModel.sectionConfig



                    function isWeightVisible() {
                        var m = JSON.parse(Settings.commodities)
                        return root.commodity && root.commodity.length && m[root.commodity.toLowerCase()]["measuredByWeight"]
                               && !(Session.inspection_type === "training")
                    }

                    function initialize() {
                        valueState = root.inspectionTareWeight ? "Selected" : "Empty"
                        return (valueState == "Empty") ? true : false
                    }

                    onSelectionChanged: {
                        root.inspectionTareWeight = newItem
                    }

                    onValueChanged: {
                        if(!isEmptyVal(root.inspectionGrossWeight)){
                            (Number(root.inspectionTareWeight) >= Number(root.inspectionGrossWeight)) ? notifytareText.show("Dlvy Tare wt should be less than Dlvy Gross weight") : notifytareText.hide()
                        }
                    }
                }

Please advise on the best method to handle it while pressing the tab key. focus should also change

That should work out of the box. What exactly is the problem?