BAPI_ACT_STRUCTURE 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 "BAPI structure network activity" 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_BAPI_ACT_STRUCTURE TYPE BAPI_ACT_STRUCTURE.
The BAPI_ACT_STRUCTURE table consists of various fields, each holding specific information or linking keys about BAPI structure network activity data available in SAP. These include ACTIVITY_NUMBER (Activity number in network and standard network), CONTROL_KEY (Control key), WORK_CNTR (Work center), PLANT (Plant)... 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. .