BAPIFRML_OUTPUT_SUB 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-FRM: Output Item LoRS (Substance)" 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_BAPIFRML_OUTPUT_SUB TYPE BAPIFRML_OUTPUT_SUB.
The BAPIFRML_OUTPUT_SUB table consists of various fields, each holding specific information or linking keys about RMS-FRM: Output Item LoRS (Substance) data available in SAP. These include FLGPRIMKEY (Creation of New Data Record with Artificial Primary Key), FOREIGNKEY (Artificial Foreign Key for BAPI Formula Objects), FLGFRGKEY (Creation of New Data Record with Artificial Foreign Key), CLIENT (Client)... 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. .