PSO56 is a standard SAP Table which is used to store Customizing for Fixed Values on Initial Screen data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The PSO56 table consists of various fields, each holding specific information or linking keys about Customizing for Fixed Values on Initial Screen data available in SAP. These include BUKRS (Company Code), BLART (Document Type)... 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. .