KOMPAXA 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 "Pricing: Cost Split in SD Document; Fields Able to be Added" 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_KOMPAXA TYPE KOMPAXA.
The KOMPAXA table consists of various fields, each holding specific information or linking keys about Pricing: Cost Split in SD Document; Fields Able to be Added data available in SAP. These include NETWR (Net Value in Document Currency), MWSBP (Tax amount in document currency), NETPR (Net price), WAVWR (Cost in document currency)... 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. .