CKI_DOC_ML 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 documenting reports,..." 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_CKI_DOC_ML TYPE CKI_DOC_ML.
The CKI_DOC_ML table consists of various fields, each holding specific information or linking keys about Structure for documenting reports,... data available in SAP. These include SENDER (Sender object), TEST (Perform test run), ALLMATS (Select All Materials), FEWMATS (Select Only Certain Materials)... 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. .