You Must Integrate ERP Into Your Other Systems

ERP systems in and of themselves do not impart business advantage, the key words being "in and of themselves." They are critical core systems in achieving competitive advantage, but what really delivers advantage is unique capability in your market. And that normally means some degree of customization, integrating--as much as possible--the ERP system with other internal and external systems. Integration does pay off, according to IDC Research, which says that revenue gains may range from 7 to 16 percent, cost reductions from 9 to 15 percent. So this suggests that ERP is just the first step, not the ultimate destination.
Source: CRM Buyer