FMBDC is a standard SAP Table which is used to store Object table 2 data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The FMBDC table consists of various fields, each holding specific information or linking keys about Object table 2 data available in SAP. These include OBJNR (Object number for FI-SL tables), CEFFYEAR_9 (Year of Cash Effectivity), VALTYPE_9 (BCS Value Type), WFSTATE_9 (Workflow Status of a Record in the Budget Totals Table)... 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. .