KOMP_UI 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 "Difference UI Pricing Communication 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_KOMP_UI TYPE KOMP_UI.
The KOMP_UI table consists of various fields, each holding specific information or linking keys about Difference UI Pricing Communication Item data available in SAP. These include VRKME (Sales unit), NETWR (Net Value in Document Currency), WAERK (SD Document Currency), MWSBP (Tax amount 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. .