PPM_KEY_1 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 "Internal Key for PPM Mapping (Keys Only)" 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_PPM_KEY_1 TYPE PPM_KEY_1.
The PPM_KEY_1 table consists of various fields, each holding specific information or linking keys about Internal Key for PPM Mapping (Keys Only) data available in SAP. These include WERKS (Plant), VERID (Production Version), PLNTY (Task List Type), PLNNR (Key for Task List Group)... 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. .