WCS_SP_WAPI_INSTANCE 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 "WCM SP: Application (Instance ID)" 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_WCS_SP_WAPI_INSTANCE TYPE WCS_SP_WAPI_INSTANCE.
The WCS_SP_WAPI_INSTANCE table consists of various fields, each holding specific information or linking keys about WCM SP: Application (Instance ID) data available in SAP. These include WAPINR (Application)... 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. .