Which is better creating view accessor based on view object or view instanc

When creating view accessors whether in the entity object or in the view object, we have two options:
1- create the view accessor based on a view object.
2- create the view accessor based on a view instance.
what are the differences between these two options?
what are the cases where I should only use option 1 or option 2?
which one is better?

Hello Timo,
I will try to explain my question better.
when we create view accessor, after click on create new view accessor icon, the create view accessor window is opened, at the header of this window there is a statement says:
Select a view object or shared view instance and shuttle it to the selected list to create a view accessor.
and here is my concern, which one to use
1- select a view object from one of the available view object and shuttle it to the selected list.
2- select a view instance from the application module and shuttle it to selected area.
If you have FOD sample (and I am sure you have it :) ), I see that oracle team has used both of them in different places, for examples
1- in oracle.fodemo.storefront.entities.PersonEO all view accessors are created from view instance in SharedLookupService application module.
<ViewAccessor
    Name="PersonTypesVA"
    ViewObjectName="oracle.fodemo.storefront.lookups.LookupsBaseVO"
    AMUsageName="SharedLookupService"
    ViewInstanceName="PersonTypes"/>is it because they are used to create LOV?
2- in oracle.fodemo.storefront.entities.OrderEO the view accessor is created from a view object, not from instance inside application module.
    <ViewAccessor
    Name="OrdersVO"
    ViewObjectName="oracle.fodemo.storefront.store.queries.OrdersVO"/>I couldn't find the usage of this accessor?
Hope it is clear now.

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Message was edited by: Jens Weiler
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