CUST03 is a standard SAP Table which is used to store Table for Determining General Characteristics data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The CUST03 table consists of various fields, each holding specific information or linking keys about Table for Determining General Characteristics data available in SAP. These include APPL (Application indicator), DEF_REPL (Default configured group (replacement)), DEF_ADD (Default configured group (additional)), SEPA_IND (Separators)... 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. .