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I would say it is mostly about the restriction on what processing/operating environments the system is able of utilizing. To be clearer, when you select an ERP system, make sure you choose a system which give you the maximum possible number of operating configuration. This way you would know that you have an ERP system that would be flexible through its entire life-cycle. This way you can contain all kind of users from the ones using oldest OS available to newest one in addition to terminals.
So to sum it up, the customer requirements are ever-changing, they will keep changing on daily basis so a business needs to make sure it keeps not only up to date but up to future.
a suggestion from me would be that keep in mind functionality and RDBMS are important keys to an ERP system. They are important for flexibility and reducing upgrades costs in the future.
good luck