BBP_SEL_ADDTYPE 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 Screen Control When Adding Unplanned Items" 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_BBP_SEL_ADDTYPE TYPE BBP_SEL_ADDTYPE.
The BBP_SEL_ADDTYPE table consists of various fields, each holding specific information or linking keys about Structure for Screen Control When Adding Unplanned Items data available in SAP. These include SCREEN_NEW_ITEM (Control Element for Unplanned Items), SCREEN_PRESETS (Control Element for Unplanned Items)... 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. .