BAPIACTX09 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 "Tax item" 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_BAPIACTX09 TYPE BAPIACTX09.
The BAPIACTX09 table consists of various fields, each holding specific information or linking keys about Tax item data available in SAP. These include GL_ACCOUNT (General Ledger Account), COND_KEY (Condition Type), ACCT_KEY (Transaction Key), TAX_CODE (Tax on sales/purchases code)... 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. .