BAPIACPMBLK 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 Information for Changing the Payment Block" 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_BAPIACPMBLK TYPE BAPIACPMBLK.
The BAPIACPMBLK table consists of various fields, each holding specific information or linking keys about Reference Information for Changing the Payment Block data available in SAP. These include OBJ_KEY (Reference Key), OBJ_SYS (Logical system of source document), COMP_CODE (Company Code), DSCT_DAYSOFF (Offset Cash Discount Days)... 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. .