Hello, I am currently trying to create a program that will auto calculate a refill field and a threshold field and schedule it to run every night. We want to take 60 days worth of data and divide it by 2 to get an average for a month and then divide it by two again to get our threshold. I have not ran my code yet because I am nervous if it is wrong, it will change all the values to wrong. Any help/advice would be greatly appreciated. 

2. //Fetching all records from Book and Invoice Tables
3. Books = Books[ID != 0];
4. Invoice_Data = Invoice_Data[ID != 0];
5. //getting a value that is 2 months less than today's date
6. two_months_ago = subMonth(zoho.currentdate,2);
7. //If date field is in the last 60 days. 
8. if(Invoice_Data.Date_field > two_months_ago)
9. {
10. for each  Each_Book in Invoice_Data
11. {
12. //Counting all the books in invoice in last 2 months and dividing by 2
13. Total_Books = Invoice_Data[Book = Book].count();
14. Total_Books2 = Total_Books / 2;
15. Total_Books3 = Total_Books2 / 2;
16. //converting decimal to Long
17. Total_Books_Threshold = Total_Books3.toLong();
18. Total_Books_Refill = Total_Books2.toLong();
19. //Updating refill/threshold 
20. Books.Refill_To=Total_Books_Refill;
21. Books.Refill_Threshold=Total_Books_Threshold;
22. }
23. }