This extension provides adds a grouping into products. The main aims is to group line items in the invoice via these groupings
Note: tax rates per line item was developed for this extension - so thanks to Bernardo for funding this.
This extension is designed for Simple Invoices 2009.1
You need to edit ./config/config.ini and enable the product matrix extension, refer how_to_enable_an_extension for how to do this
This extension was developed by Justin Kelly of SixHQ
This extension is released under the GNU GPL v3