Retail is a field of ERP, but it has some challenges. Implementation of ERP in big retail organizations takes a lot of planning. Big retail organizations are characterized by a high volume of transactions originating in many different locations. The more attention paid to details in the planning and implementation stages, the more smoothly the implementation will go. Rick Cook (writes articles on computers and related technology), writes in his article about the challenges faced while implementing ERP in the retail sector and why planning is important at - http://it.toolbox.com/blogs/inside-erp/implementing-retail-erp-70373