TKB3 is a standard SAP Pooled Table which is used to store Settings for Default Rules data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The TKB3 table consists of various fields, each holding specific information or linking keys about Settings for Default Rules data available in SAP. These include OBART (Object type of settlement sender), EMTYP (Account assignment category), EFELD (Field for which default is intended), LFDNR (Sequence number (three characters))... 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. .