FPLAA_WBS 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 "WBS element: Application data for the billing plan" 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_FPLAA_WBS TYPE FPLAA_WBS.
The FPLAA_WBS table consists of various fields, each holding specific information or linking keys about WBS element: Application data for the billing plan data available in SAP. These include POST1_PR (PS: Short description (1st text line)), PSPHI (Current number of the appropriate project), POST1_PD (PS: Short description (1st text line)), PPROF (Planning profile)... 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. .