BAPI_RCOMH 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 "BAPI PI-PCS Interface: IDs of Messages Created" 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_BAPI_RCOMH TYPE BAPI_RCOMH.
The BAPI_RCOMH table consists of various fields, each holding specific information or linking keys about BAPI PI-PCS Interface: IDs of Messages Created data available in SAP. These include PROC_MESS_ID (Number of the Process Message)... 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. .