TFCS is a standard SAP Pooled Table which is used to store Permissible Source Tables per Application data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The TFCS table consists of various fields, each holding specific information or linking keys about Permissible Source Tables per Application data available in SAP. These include SQTAB (Source table), SUHIE (Hierarchy (document header, item,...) of statistics update)... 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. .