A820 is a standard SAP Table which is used to store Advanced Returns Management - Customer Return Reason data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The A820 table consists of various fields, each holding specific information or linking keys about Advanced Returns Management - Customer Return Reason data available in SAP. These include KAPPL (Application), KSCHL (Condition type), MSR_RET_REASON (Return Reason), DATBI (Validity end date of the condition record)... 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. .