How to prevent creation already exist object?

In our erp system we can see If a object (Customer, Address) is already existed then system doesn’t throw exception. Instead it’s created object adding a number (increment) tailing of the name field.

For an Example:

name is the primary key for Customer. XYZ customer is already exist in our system now I’d like to create another customer with the same name XYZ then system showing following message:
Changed customer name to 'XYZ - 1' as 'XYZ' already exists.

Our expectation is system should throw an exception and prevent customer creation.

Go to Selling Settings and select Customer Naming By “Naming Series”

It will solve your issue.

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