MSAM10_LONGTEXT 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 "Long Texts" 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_MSAM10_LONGTEXT TYPE MSAM10_LONGTEXT.
The MSAM10_LONGTEXT table consists of various fields, each holding specific information or linking keys about Long Texts data available in SAP. These include OBJKEY (Item Key: Defect; Cause, Task...), LINE_NUMBER (Line number within table), FORMAT_COL (Tag column), TEXT_LINE (Character 1024)... 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. .