First of all make open Soft4 Setup and make Notification Engine Advanced.

Then open Notification Setup (SOFT4) page and setup sales invoice type. After that open Recipients Setup

Select Recipient Type, after that you will also have to setup email template

Configure all these parameters

After that run job queue which will generate notification entries

Entries can be found in Notification Entries (SOFT4) page:

Things to keep in mind:

• Emails are only generated for the sales invoices which does not have S4LIB Notification Status: Completed
• There are three anchors for the email description text
  • %1 - Customer No.
  • %2 - Agreement No.
  • %3 - Sales Invoice Header No.
• If entry was not generated, check Activity log for the errors.