IWPC_KEYFS 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 "Costing Maintenance Plan/Task List: Key Figures" 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_IWPC_KEYFS TYPE IWPC_KEYFS.
The IWPC_KEYFS table consists of various fields, each holding specific information or linking keys about Costing Maintenance Plan/Task List: Key Figures data available in SAP. These include SMEG (Consumption quantity), MEINH (Unit of Measure), SWG (Amount), CURTYPE (Currency 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. .