Potential Products on Communication template
I don't believe you can include merge fields for the potential product line items in an email template but perhaps someone can enlighten me othewise.
The use case is that when an opportunity is won a workflow rule fires and sends the contact an email with information about the sale (we don't use sales orders as it requires duplication of user effort). However there doesn't appear to be a way to include the product data on the email template. Very frustrating.
As a workaround I tried to avoid the use of the products related list and add multiple fields on the Potential table - but very quickly exceeded the maximum number of custom quantitative fields on the object (15?).