UPWB_YS_REPLACE is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Replace Item in Template" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_UPWB_YS_REPLACE TYPE UPWB_YS_REPLACE.
The UPWB_YS_REPLACE table consists of various fields, each holding specific information or linking keys about Replace Item in Template data available in SAP. These include REPLACE (Any String), REFERENCE (Boolean Variable (X=True, -=False, Space=Unknown))... 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. .