Enterprise Resource Planning (ERP) systems are like bears. Some are pandas, living in very limited environments in western China and subsisting exclusively on bamboo shoots. Others are like grizzlies; they can live anywhere and eat anything. In the world of ERP, the grizzlies are the flexible systems that accommodate ease of parameterization, and the pandas are the ones that don't.
ERP is designed to be comprehensive. Financial systems, logistics and distribution, purchasing, sales, and manufacturing are all part of one system. Using the same software company-wide eliminates most problems with data integration and facilitates oversight of procedures across all company functions.