DISPLAY_PI 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 Issuing Promotions" 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_DISPLAY_PI TYPE DISPLAY_PI.
The DISPLAY_PI table consists of various fields, each holding specific information or linking keys about Structure for Issuing Promotions data available in SAP. These include BOTEXTPI (Description of the promotion), ABREX (External description for agreement), VKORG (Sales Organization), VTWEG (Distribution Channel)... 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. .