PMTX_SET 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 "Structure for Renaming PM Object Texts" 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_PMTX_SET TYPE PMTX_SET.
The PMTX_SET table consists of various fields, each holding specific information or linking keys about Structure for Renaming PM Object Texts data available in SAP. These include TEXTID (Text ID), SPRAS (Language key), OLDNAME (Name), NEWNAME (Name)... 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. .