FMMD_SUBSTRING_COPY 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 display the substring copying result in log" 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_FMMD_SUBSTRING_COPY TYPE FMMD_SUBSTRING_COPY.
The FMMD_SUBSTRING_COPY table consists of various fields, each holding specific information or linking keys about Structure for display the substring copying result in log data available in SAP. These include OK (Version Number Component), MSGCL (Application Area), MSGNR (Message number), MASDAT (Account Assignment Element)... 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. .