Create Linking Invoice in Zoho Books

Difficulty: Intermediate
Estimated reading time: 5 mins
Estimated implementation time: 1 hour


This custom function will create an additional invoice based on the Event Date of a previous Invoice in Zoho Books. Here are some details of how it works:

  • The newly created invoice will be of the same amount as the primary invoice
  • The Due Date of the newly created invoice will be 14 days before the Event Date, unless the event date is less that 14 days out, in which case the due date will be set to the current date.
  • This will add a URL of the newly created Invoice on the primary Invoice, and the URL of the primary Invoice on the newly created Invoice.
  • This will not work if the items on the Invoice are serialized.


To make this custom function work, you will need to add two custom fields in Zoho Books:

  • Event Date [Date Type: Date]
  • Linking Invoice [Data Type: URL]
					// Org and Invoice Info
organizationId = organization.get("organization_id");
invoiceId = invoice.get("invoice_id");

// Primary Invoice Info
primaryInvoiceSearch = zoho.books.getRecordsByID("Invoices",organizationId,invoiceId);
primaryInvoice = primaryInvoiceSearch.get("invoice");
info "Primary Invoice:";
info primaryInvoice;
info "|++++++++++++++++++++++++++++++++++++++++|";

// Process Custom Fields
primaryInvoiceCustomFields = primaryInvoice.get("custom_fields");
primaryInvoiceUrl = "" + invoiceId;
eventDate = null;
linkingInvoice = null;
for each  customField in primaryInvoiceCustomFields
	if(customField.get("placeholder") == "cf_event_date")
		eventDate = customField.get("value");
	else if(customField.get("placeholder") == "cf_linking_invoice")
		linkingInvoice = customField.get("value");

// Create Secondary Invoice
secondaryInvoiceMap = Map();

// Set Due Date to Two Weeks Before Event Date
secondaryDueDate = null;
if(primaryInvoice.get("due_date").daysBetween(eventDate) >= 14)
	secondaryDueDate = eventDate.subDay(14);
else {
	secondaryDueDate = zoho.currentdate;
secondaryInvoiceMap.put("custom_fields",{{"label":"Linking Invoice","value":primaryInvoiceUrl},{"Label":"Event Date","value":eventDate}});

// Set Line Items
lineItemsList = List();
for each  lineItem in primaryInvoice.get("line_items")

// Create Secondary Invoice
createSecondaryInvoice = zoho.books.createRecord("Invoices",organizationId,secondaryInvoiceMap);
info "Create Secondary Invoice:";
info createSecondaryInvoice;
info "|++++++++++++++++++++++++++++++++++++++++|";
secondaryInvoice = createSecondaryInvoice.get("invoice");
secondaryInvoiceId = secondaryInvoice.get("id");

// Update Primary Invoice with Linking Invoice URL
secondaryInvoiceUrl = "" + secondaryInvoiceId;
updatePrimaryInvoiceMap = Map();
updatePrimaryInvoiceMap.put("custom_fields", {{"label":"Linking Invoice","value":secondaryInvoiceUrl}});
updatePrimaryInvoice = zoho.books.updateRecord("Invoices", organizationId, invoiceId, updatePrimaryInvoiceMap);
info "Update Primary Invoice:";
info updatePrimaryInvoice;
info "|++++++++++++++++++++++++++++++++++++++++|";

Click here to copy these scripts. For more Zoho-wizardry, check out our GitHub page.

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