When to use Generalization and When to use one-one association with real time example?

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Can anyone elaborate?  
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There is documentation describing the pro's and cons for both options:

https://docs.mendix.com/refguide/generalization-and-association/

You could have a generic PurchaseOrder storing the information of an order, but depending on the department there are specific details that vary. You could create a specialisation of PurchaseOrder to capture the different variations or create an associated entity PurchaseOrderDetails and associate that with one-to-one association.

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