ITOBAPI_MODIFY 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 "PM: Modifiable ITOB Fields, Equis + FunctLocs With APIs" 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_ITOBAPI_MODIFY TYPE ITOBAPI_MODIFY.
The ITOBAPI_MODIFY table consists of various fields, each holding specific information or linking keys about PM: Modifiable ITOB Fields, Equis + FunctLocs With APIs data available in SAP. These include BEGRU (Technical object authorization group), EQART (Type of Technical Object), INVNR (Inventory number), GROES (Size/dimension)... 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. .