If you have been tasked with building an EDI integration between your business and a retailer, you may be wondering where to start? A typical evolution path for people to work with EDI is to start with a single trading partner that you need to trade with and focus on a single document you may need to send, like an invoice. Before you send the invoice, you may receive a purchase order from your trading partner, which will most likely be in X12. You will need to take this purchase order information, map it to your ERP or other system, transform it to a format your system will understand, and load it into your system. Then, you will use your ERP to generate an invoice. That invoice will need to be converted to X12 and then sent to your partner. So where do you start?