Add project name in ZOHO Books invoice

Add project name in ZOHO Books invoice

I really like the custom template feature you offer in ZOHO Books.

One question: How do I add the name of the project just under the word "Invoice" at the top of invoices.

I have tried adding %ItemName% to the table that has Invoice Date and Invoice #, but it comes out blank. Yet it works for the email subject line. Please tell me what placeholder to use in this situation.

Thank you very much.