RMSLS_USAGE_EXT 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 "Label Object Usage" 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_RMSLS_USAGE_EXT TYPE RMSLS_USAGE_EXT.
The RMSLS_USAGE_EXT table consists of various fields, each holding specific information or linking keys about Label Object Usage data available in SAP. These include MANDT (Client), USAGE_OBJNO (Internal Key of a Usage), AENNR (Change Number), USAGECNT (Internal Usage Counter)... 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. .