FV12M_NODE_LEVEL 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 "Node Level" 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_FV12M_NODE_LEVEL TYPE FV12M_NODE_LEVEL.
The FV12M_NODE_LEVEL table consists of various fields, each holding specific information or linking keys about Node Level data available in SAP. These include FIELDNAME (Field Name), DATAELEM (Data element (semantic domain)), ICON (Tree Control: Icon / Image)... 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. .