in zoho creator Sales Returns form has sub form Line Items return quantity when i upate the or enter any values in the sub form that want to reflect in the Sales Order form item deail sub form field Q

in zoho creator Sales Returns form has sub form Line Items return quantity when i upate the or enter any values in the sub form that want to reflect in the Sales Order form item deail sub form field Q

in zoho creator Sales Returns form has sub form Line Items return quantity when i upate the or enter any values in the sub form that want to reflect in the Sales Order form item deail sub form field Quantity Returned\

pls  check the recording

fetch_salesorder = Sales_Order[ID == input.Sales_Order];
for each  return_item in input.Line_Items
{
item_name = return_item.Items_Description;
returned_qty = return_item.Return_Quantity;
for each  order_item in fetch_salesorder.Item_Details
{
if(order_item.Product_Name == item_name)
{
// Handle null value safely using ifnull()
existing_qty = ifnull(order_item.Quantity_Returned,0);
order_item.Quantity_Returned=existing_qty + returned_qty;
}
}
}