Most small retailers hear EDI and think it is something only the big chains do.
It is not. EDI is simply how orders, invoices, and shipping notices move between you and your trading partners without someone retyping them by hand.
I have spent seven years inside this world, most of it supporting retail supply chains. Here is the simple version.
When a retailer sends you a purchase order, it arrives as an 850. You ship the goods and send back an 856, the advance ship notice, so their warehouse knows exactly what is coming. Then the 810 invoice closes the loop. Three documents. That is most of retail EDI.
Your ERP sits in the middle of all this, Oracle or otherwise. It holds the truth about your inventory and your orders. EDI is what moves that truth between systems. The map between your ERP's format and the standard document is where things break. A wrong ship notice means a chargeback from the retailer. I have seen small suppliers lose real money this way.
The good news: you do not need to understand every transaction set. You need clean item data, one person who watches the exceptions each morning, and a partner or tool that handles the mapping.
Get those three right, and EDI stops being a compliance headache. It becomes the quiet system that lets you sell to bigger retailers without hiring three more people.
That is the part I help small businesses build.