Collections virtual auto incremental number

[AVTS]

Experts ,

I am trying to bring auto incremental serial numbers against the collection row, Following code is applied. 

If(
    Connection.Connected,
    Collect(
        test1,
        Getlogo.Run(
            LookUp(
                Dailyusers,
                email = User().Email,
                route
            )
        )
    );


 LoadData(
        test1,
        "MyLocalData",
        true
    );

SaveData(
    test1,
    "MyLocalData"
);

---------------------------


ClearCollect(
    test2,
    {
        priority: "",
        state: "   ",
        sequence: "",
        shortText: "",
        orderNumber: "",
        breakdownSymptomCode: "",
        breakdownSymptomGroupCode: "",
        customerCode: "",
        equipmentCode: "",
        orderDate: "",
        adviceText: "",
        center: "",
        syncType: "",
        routeId: "",
        activityClass: "",
        serviceType: "",
        orderClass: "",
        orderstatus: ""
    }
);



LoadData(
    test2,
    "MyLocalData"
);



Gallery --- Items

GroupBy(test2,"orderNumber","customerCode","activityClass","orderstatus")


Inside Gallery :  ThisItem.orderNumber
Inside Gallery :  ThisItem.customerCode
Inside Gallery :  ThisItem.orderstatus
Inside Gallery : Autoincremental Number : ThisItem.orderNumber+1

Gallery view

Below is the result, in which serial no is incorrect,

expected result ,

How to achieve this.