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  • I think the business logic might be different too. Since the technology used could be a determining factor in the logic the business depends on. Commented Apr 27, 2021 at 16:27
  • @IbrafimMohamed Nope. Whether you are using text files or a relational database, whether using a green-screen or a GUI, whether you are using magnetic tape or SSDs, what remains constant is the business rule about an invoice having at least one line item. Commented Apr 27, 2021 at 16:31