BBSEG_FM 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 "Document Segment Accounting for IS-PS(Batch Input 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_BBSEG_FM TYPE BBSEG_FM.
The BBSEG_FM table consists of various fields, each holding specific information or linking keys about Document Segment Accounting for IS-PS(Batch Input Structure) data available in SAP. These include TBNAM (Table Name), NEWBS (Posting Key for the Next Line Item), DUMMY (Do Not Use Field - Use Field NEWKO), NEWUM (Special G/L Indicator for the Next Line Item)... 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. .