SAP VDM有3种类型，分别是BASIC、COMPOSITE、CONSUMPTION
#BASIC – Used to pull data from the source tables as well as the other basic views but are not used in reporting.
#COMPOSITE – act as an interface between the basic and the consumption views. Can use source tables or different views to form a data set.
(The above 2 views are more or less the same. The difference is to do with the modeling methodology and the reusability of code.)
#CONSUMPTION – when the views have to be ‘consumed’ by the reporting layer.
