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