BAPISDCA 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 for Table CMPB_ASGN" 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_BAPISDCA TYPE BAPISDCA.
The BAPISDCA table consists of various fields, each holding specific information or linking keys about BAPI Structure for Table CMPB_ASGN data available in SAP. These include DOC_NUMBER (Sales and Distribution Document Number), ITM_NUMBER (Item number of the SD document), CAMPAIGN (Generic project planning: GUID from external R/3 system), SEQNO (Campaigns: Counter for Sequence)... 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. .