GRFN_S_EVAL_PATH 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 "Evaluation Path structure" 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_GRFN_S_EVAL_PATH TYPE GRFN_S_EVAL_PATH.
The GRFN_S_EVAL_PATH table consists of various fields, each holding specific information or linking keys about Evaluation Path structure data available in SAP. These include RSIGN (Relationship Specification), RELAT (Relationship Between Objects), PRIOX (Priority), SCLAS (Object Type)... 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. .