CMS_STR_PCN_A_MSG 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 "Messages severity change for a business activity" 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_CMS_STR_PCN_A_MSG TYPE CMS_STR_PCN_A_MSG.
The CMS_STR_PCN_A_MSG table consists of various fields, each holding specific information or linking keys about Messages severity change for a business activity data available in SAP. These include PROC_OBJ (Process Object), PROC_CKY (Process Control Key), PROC_AREA (Process Control Area), CR_TYPE (Change Request Type)... 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. .