i do not think generating a report every time to view a customer detail would be a solution. it is not necessary that a business is always looking for the accounting data. there are simply other things in day-to-day activities where an office staff would require the tax identifier/email/contact/address/anything you can imagine of a customer/supplier.
also, like @Ealfardan mentioned we can attach the contracts/agreements signed with a customer/supplier.
i really do not understand why Manager would be designed in a way that an user would input all the necessary details of a customer/supplier just so that the software alone decides when and what data appears where it needs. why cannot the user view what he has saved for his reference?