COMT_PME_XREF_IN_CLASS 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 "Where-Used List of PME Objects in Classes" 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_COMT_PME_XREF_IN_CLASS TYPE COMT_PME_XREF_IN_CLASS.
The COMT_PME_XREF_IN_CLASS table consists of various fields, each holding specific information or linking keys about Where-Used List of PME Objects in Classes data available in SAP. These include CLASS_TYPE (PME Class Type (Category or Product)), XREF_TYPE (Types of Usages of a PME Object)... 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. .