RSDMSM_DS_PARAM_MODIFY 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 "Modifications to data source parameters" 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_RSDMSM_DS_PARAM_MODIFY TYPE RSDMSM_DS_PARAM_MODIFY.
The RSDMSM_DS_PARAM_MODIFY table consists of various fields, each holding specific information or linking keys about Modifications to data source parameters data available in SAP. These include SOURCE (Source GUID), OBJVERS (Object version), MODEL (Analytical Model), VARID (Source Parameter GUID)... 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. .