IPM_MESSAGE_STRUCTURE 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 "The structure that is passed as parameter during SD mapping" 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_IPM_MESSAGE_STRUCTURE TYPE IPM_MESSAGE_STRUCTURE.
The IPM_MESSAGE_STRUCTURE table consists of various fields, each holding specific information or linking keys about The structure that is passed as parameter during SD mapping data available in SAP. These include MESSAG_ID (Message Class), MESSAGE_NUMBER (Message Number), BILLING_HEADER (Sales and Distribution Document Number), BILLING_ITEM (Item number of the SD document)... 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. .