RMSTS_DDIC_TECH_DEFINITION is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "RMS-TLS: Technical DDIC Definition of a Hierarchy Object" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_RMSTS_DDIC_TECH_DEFINITION TYPE RMSTS_DDIC_TECH_DEFINITION.
The RMSTS_DDIC_TECH_DEFINITION table consists of various fields, each holding specific information or linking keys about RMS-TLS: Technical DDIC Definition of a Hierarchy Object data available in SAP. These include TLEVEL (Node Level in Tree), SUBTREEROOT (Node Is Root of a Subtree or of Entire Tree), SUBTREEEXIST (Node Contains Subtree), PARENTKEY (Key for Higher-Level Node)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .