Old and tired technology
Traditional ERP systems often date from and are based on old client-server architectures, which cannot be easily or cost-effectively changed. A lot of effort has been used on bringing them on-line with web-based user interfaces and other functionality, but at core of the system, it is still technology dating back to the 90s and beyond. Data structures become complicated and data is being warehoused and stored in multiple sites adding complication, master data issues and errors. Adding new functionality is difficult and expensive and for example, a working enterprise-wide mobility support can be very tough.
How about Aava?