MLSTD_ML is an SAP Structure so does not store data like a database table does but can be used to process "Progress and Milestones:Milestones" 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_MLSTD_ML TYPE MLSTD_ML .
Below is the documentation avaialable and full details of the fields which make up this Structure.
|Data Type||length (Decimals)||Check table||Description||Conversion Routine|
|MLSTD||MLSTD||STRU||Progress and Milestones:Milestones|
|LTXA1||LTXA1||CHAR||40||Operation short text|
|POSID||PS_POSID||CHAR||24||Work Breakdown Structure Element (WBS Element)||ABPSN|
|POST1||PS_POST1||CHAR||40||PS: Short description (1st text line)|
|CHANGE_FLAG||INT1||INT1||3||Dummy for B20 int1 (Local Everywhere)|