EKKO is a standard SAP Table which is used to store Purchasing Document Header data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The EKKO table consists of various fields, each holding specific information or linking keys about Purchasing Document Header data available in SAP. These include EBELN (Purchasing Document Number), BUKRS (Company Code), BSTYP (Purchasing Document Category), BSART (Purchasing 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. .