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CDS Hierarchy with Hierarchy Directory and External(Text) and Postable Hierarchy Nodes

The following example is based on the SFLIGHT scenario.

Definition of Hierarchy 

Header

The annotation @ObjectModel.dataCategory: #HIERARCHY specifies the CDS view as a hierarchy. In this case, it is a Parent-Child Hierarchy(@Hierarchy.parentChild) where the following two definitions are important:

  • recurseBy : '_parent': this means that the corresponding association defines the recursion fields, in this case they are nodeid and parentid
  • directory: '_dir':  this means that the corresponding association defines the hierarchy directory
Body of the view 

Associations
    • association ' _dir': the associated view defines the hierarchy directory - see Hierarchy Directory
    • association '_parent': this association defines the recursion(parentid,nodeid), it refers to the view itself. See screenshot above. The fields nodeid and parentid define the recursion. 
    • association '_node': the associated view handles the texts of the nodes, see Node Texts; in BW context, these nodes(field nodename) would be called text nodes or nodes of external characteristics
    • association '_planetype': the associated view defines the basis dimension Planetype of the hierarchy - see Dimension Planetype (texts and attributes, association to the heirarchy)
Source Table zstpe_planetyp_h

Source of this view is the table zstpe_planetyp_h with the following definition and content:

So, there are two hierarchies in this table, HIER1 and HIER2. If we e.g. check the first three rows, they can be interpreted the following way:

  • node LEVEL1 is a child of the node ROOTNODE
  • NodeA is a child of node LEVEL1
  • the leaves(planetypes) A319-100 and A320-200 have LEVEL1 as their parent node
Checking Hierarchy with Transaction RSH1

It is also possible to use transaction RSH1 in order to take a look at the hierarchy. You need to enter the name of the characteristic(which is the 2C'SQLViewName' of the corresponding dimension), then you get a list of all available hierarchies displayed:

The nodes like 'NODE X' are handled in BW like so called nodes of external characteristics(see external characteristics).

Hierarchy used in CDS Cube

The dimension 'planetyp' is now used in a CDS view of dataCategory:#CUBE:

 We run the so called adhoc query in Transaction RSRT: Query Monitor:

and then navigate to the Properties of Planetyp:

Two hierarchies are offered, we choose HIER1 and check the result:

Please compare the hierarchy with the content of the table above. In particular, note that A340-600 is a so called postable node, the other nodes are text nodes or nodes of external characteristcs(see external characteristics), respectivelly.

 

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