How to update custom field for each invoice item by deluge ?

How to update custom field for each invoice item by deluge ?

I have below code to try to update custom field named "Com".
When I run it, I get this error message
"{"code":15,"message":"Please ensure that the invoice_items has less than 100 characters."}"

The reason I tried this way is because I didn't find how to update only "Com" custom field for each item on invoice.
It's best If I can update only that field. (Please let me know If you know this way) but I couldn't find it.
So I just get all invoice_items field and then add new custom field inside then try to update but I get characters limit error.

Please help me if you know how to solve this issue.
Thank you.

  1. invoiceID = invoice.get("invoice_id");
  2. organizationID = organization.get("organization_id");
  3. salesperson_name = invoice.get("salesperson_name");
  4. invoice_items = invoice.get("invoice_items");
  5. custom_fields = invoice.get("custom_fields");
  6. sale_type = "";

  7. for each  item in custom_fields
  8. {
  9. label = item.get("label");
  10. if(label == "Sale Type")
  11. {
  12. sale_type = item.get("value");
  13. }
  14. }
  15. invoice_items = invoice.get("invoice_items");
  16. new_invoice_items = List();

  17. for each item in invoice_items
  18. {
  19. item_custom_fields = item.get("item_custom_fields");
  20. type = "";
  21. for each  item2 in item_custom_fields
  22. {
  23. label = item2.get("label");
  24. if(label == "Type")
  25. {
  26. type = item2.get("value");
  27. }
  28. }
  29. product_name = item.get("name");
  30. splitProductname = product_name.toList("-");
  31. commision_detail = zoho.crm.searchRecords("commsions_structure","(Staff_Member.name:equals:" + salesperson_name + ") and (Product.name:equals:" + splitProductname.get(0) + ") and (Sale_Type:equals:" + sale_type + ") and (Type:equals:" + type + ")");
  32. if(commision_detail.size() > 0)
  33. {
  34. commision = commision_detail.get(0).get("Commission");
  35. }
  36. CustomField = Map();
  37. CustomField.put("label","Com");
  38. CustomField.put("value",5);
  39. item.put(CustomField);
  40. new_invoice_items.add(item);
  41. }

  42. test = List();
  43. test.add(new_invoice_items);

  44. values = Map();
  45. values.put("invoice_items",test);

  46. response = zoho.invoice.update("Invoices",organizationID,"3878353000003769092",values,"zohoinvoice");
  47. info response;





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