FMPRINT_HEAD 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 "Header Data of Entry Document During Printing" 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_FMPRINT_HEAD TYPE FMPRINT_HEAD.
The FMPRINT_HEAD table consists of various fields, each holding specific information or linking keys about Header Data of Entry Document During Printing data available in SAP. These include CPUDT (Date Document Was Created), BUDAT (Posting Date in the Document), BLDAT (Document Date), VADAT (Planning/budgeting value date)... 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. .