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By using a filter, an end-user can quickly locate the business objects they want to action (e.g.: All , all employees who started work last year).
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Each business object in the instance list is called an instance.
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As you can see the filter's job is to filter out employees that match the users selection criteria (in this case a surname that starts with B) and then to feed them into the instance list.
You can customize the settings of an instance list using the properties of the business object.