How to customise the invoice task list in PDF / External view
You may overwride the default invoice task list by following these instructions.
Note: some level of HTML and possibly PHP experience may be required for this.
locate the file: includes/plugin_invoice/template/invoice_task_list.php
Create a new folder called "custom" in the main UCM directory.
Copy the invoice_task_list.php file into this new "custom" folder, including the original path, like this:
Edit this new file within the custom folder