ACT01_REF 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 "Reference structure for source and target 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_ACT01_REF TYPE ACT01_REF.
The ACT01_REF table consists of various fields, each holding specific information or linking keys about Reference structure for source and target network activity data available in SAP. These include APLZL_SOURCE (General counter for order), AUFPL_DEST (Routing number of operations in the order), APLZL_DEST (General counter for order), SOURCE_OBJNR (Object number)... 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. .