ABAP_DESCRIPTION In a reflexive mesh association (self-association), the source and target nodes are the same. A reflexive mesh association implements semantic relationships between the lines of a mesh node. This example shows the result sets of reflexive mesh associations for an internal table in which a hierarchical tree structure is stored.
Simple reflexive mesh association mesh-node _node[ mesh-node[ id = id ] ] The result set includes all lines in which, in accordance with the ON condition, the column parent_id is the same as the column id of the source. In the tree hierarchy, these are the direct subnodes of the line described using source.
Transitive mesh association with + mesh-node _node+[ mesh-node[ id = id ] ] The result set also includes all further lines for which, based on the first result set, the ON condition is met. In the tree hierarchy, these are all subnodes of the line described using source .
Transitive mesh association with * mesh-node _node*[ mesh-node[ id = id ] ] The result set also includes the line described by source.
