invoiceID = invoice.get("invoice_id");

invoicedate = invoice.get("date").toDate();

organizationID = organization.get("organization_id");

customerID = invoice.get("customer_id");

invDetails = zoho.books.getRecordsByID("invoices",organizationID,invoiceID).get("invoice");

lineitems = invDetails.get("line_items").toList();

iList = List();

info 'hello';

for each  find in lineitems

{

imap = Map();

itemtotal = find.get("rate").toDecimal();

    <collection>.get(<expression>);

item_custom_fields = find.get("item_custom_fields").toList();

itemcfList = List();

for each  ifs in item_custom_fields

{

itemmap = Map();

lab = ifs.get("label").toString();

val = ifs.get("value");

if(lab == "cf_no_of_bags")

{

a = ifs.get("value").toDecimal();

}

else if(lab == "cf_weight_of_each_bag")

{

b = ifs.get("value").toDecimal();

}

}

C = a * b / 100;

imap.put("quantity",C);

imap.put("line_item_id",find.get("line_item_id"));

iList.add(imap);

}

json = Map();

json.put("customer_id",customerID);

json.put("line_items",iList);

json.put("reason","no reason");

update = zoho.books.updateRecord("invoices",organizationID,invoiceID,json);

info update.get("message");