FMSHD300 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 "FMSHERLOCK Structure for Screen 300" 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_FMSHD300 TYPE FMSHD300.
The FMSHD300 table consists of various fields, each holding specific information or linking keys about FMSHERLOCK Structure for Screen 300 data available in SAP. These include STATUS (Processing Status), KGRUND (Clarification Reason), KUKEY (Short key (surrogate)), ESNUM (Memo record number (line item number in bank statement))... 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. .