CMS_STR_REL_DETAIL 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 "Relationship Details" 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_REL_DETAIL TYPE CMS_STR_REL_DETAIL.
The CMS_STR_REL_DETAIL table consists of various fields, each holding specific information or linking keys about Relationship Details data available in SAP. These include REL_PRIORITY (Priority of a Relationship), CALC_TYP (Calculation type for relations of collateral agreements)... 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. .