PSO55 is a standard SAP Table which is used to store Negative Posting in Requests data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The PSO55 table consists of various fields, each holding specific information or linking keys about Negative Posting in Requests data available in SAP. These include BUKFM (Company Code Group FM), GJHID (Fiscal Year ID), BLART (Document Type), XNEGP (Indicator: Negative Postings Permitted)... 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. .