Release Procedure With And Without Classification

What are the differences between release procedure with classification and release procedure without classification? When are they used?
Is it possible to have a release procedure without classification for a PO?
Two different procedures are available for requisitions:
With classification
With this procedure, requisitions can be released both at item level (i.e. item-by-item) and in total. The latter approach is also termed "overall release".
Without classification
With this procedure, requisitions can only be released at item level.
The two procedures are mutually exclusive (that is to say, you must decide in favor of one of them only - you cannot use both).
External purchasing documents (i.e. purchasing documents other than requisitions) are released at header level. Item-by-item release is not possible. These documents can only be released using the release procedure with classification
Requisitions without classification can have Account Assignment category, Material Group, Plant and Total Value only as characteristics, whereas in with classification you can define your own characteristics.
Release procedure without classification is possible for internal purchasing docs. There you can release at item level. But for PO we have to release at header level. We can't release them at item level. So for External purchasing docs we must set release procedure with classification. It is not possible to have release procedure without classification for PO.

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