FMPDH 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 "Screen Structure: Header Data for Payment Distribution" 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_FMPDH TYPE FMPDH.
The FMPDH table consists of various fields, each holding specific information or linking keys about Screen Structure: Header Data for Payment Distribution data available in SAP. These include BUKRS (Company Code), BELNR (Document Number of a Payment Distribution), BUDAT (Posting Date in the Document), BLDAT (Document Date in 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. .