A023 is a standard SAP Pooled Table which is used to store Additional Selling Plant/Material/Unit of Measure data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The A023 table consists of various fields, each holding specific information or linking keys about Additional Selling Plant/Material/Unit of Measure data available in SAP. These include KAPPL (Application), KSCHL (Condition type), WERKV (Resale plant), MATNR (Material 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. .