PSOSEC is a standard SAP Table which is used to store Recurring Request Document Segment, One-Time Data data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The PSOSEC table consists of various fields, each holding specific information or linking keys about Recurring Request Document Segment, One-Time Data data available in SAP. These include LOTKZ (Lot Number for Documents), BUKRS (Company Code), ITABKEY (Internal key of internal table), GJAHR (Fiscal Year)... 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. .