Function

Hi all!

I have this function:

void order.toDelivery(Orders order)
{
    status = true;
    for each recRow in order.Add_Product
    {
        product = Products[ID == recRow.Product_Name];
        balanceQuan = product.Available_Stock - recRow.Quantity;
        status = true;
        if(balanceQuan <= 0)
        {
            status = false;
        }
    }
    if(status)
    {
        for each recRow in order.Add_Product
        {
            product = Products[ID == recRow.Product_Name];
            product.Available_Stock=product.Available_Stock - recRow.Quantity;
        }
        order.Order_Status="Delivered";

It works great!
But if i update the records from "Delivered" to "Pending" again.

It won't add up again, what did i do wrong?

Thanks!