TE791 is a standard SAP Table which is used to store Mod.Reasons data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The TE791 table consists of various fields, each holding specific information or linking keys about Mod.Reasons data available in SAP. These include UMBAUGR (Modification reason)... 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. .