BAPIDOCHDRU12 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 "Document header: get costs/revenues - BAPI's actual postings" 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_BAPIDOCHDRU12 TYPE BAPIDOCHDRU12.
The BAPIDOCHDRU12 table consists of various fields, each holding specific information or linking keys about Document header: get costs/revenues - BAPI's actual postings data available in SAP. These include DOCDATE (Document Date), POSTGDATE (Posting Date), PERIOD (Period), DOC_NO (Document 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. .