Advice on Architecture for customized application

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Hi to all,

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This post is to claim for your wisdom and experience, I�m developing an application that provides certain standard functionalities: inventory management, orders, invoices, accounts receivable, etc. (I�ll call them core functionality) The problem here is that features solves the 90% of my customers requirements, BUT always need to make some customizations in order to fit each customer policies and special processes. So, the main challenge here is to design an architecture that allows me to make customer specific changes (most of the time they affect the database structure addin ...