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Amec expects to spend as little as one third of what it would have to invest in ERP from a top-five player by buying Coins software.
It has replaced legacy bespoke and Conax and Prospero software with a single system using Coins' financial module, which supports 600 users.
Bruce Turner, project manager for the implementation, said SAP could not accommodate UK-specific industry practices.
The first stages of the system will go live early next year.