How to create a freetext invoice in D365
In order to create a freetext invoice in D365, please go to Modules - accounts receivable - all freetext invoices:

First, click on "new"

Fill in the information: 2-customer, 3-date, 4-description, 5-main account, 6-item sales tax group, 7-quantity, 8-unit price

Now, switch to the tab "header" and fill in the "item sales tax group"

confirm and your invoice is ready