A022 is a standard SAP Pooled Table which is used to store Material/Unit of Measure data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The A022 table consists of various fields, each holding specific information or linking keys about Material/Unit of Measure data available in SAP. These include KAPPL (Application), KSCHL (Condition type), MATNR (Material Number), MEEIN (Unit of measure of a purchased material)... 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. .