Enterprise resource planning (ERP) systems are typically very complex and all-encompassing software. Supply chain management (SCM) systems are no slouches when it comes to complexity and scope, either. So why would a company attempt to implement both systems at the same time? Some rationalize that their software is in such dire straits that they need to get in front of the system's development curve, not just keep pace. Others rely on the "rip off the bandage with one quick pull and the pain won't be as bad" approach to software implementation. They reason that by implementing both software systems at roughly the same time, the business disruptions only have to be endured once but with great intensity. While this may work with bandages and human beings, most companies cannot withstand the shock to their organizations and personnel.…