BAPI_PROJECT_DEFINITION 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 "BAPI structure project definition" 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_BAPI_PROJECT_DEFINITION TYPE BAPI_PROJECT_DEFINITION.
The BAPI_PROJECT_DEFINITION table consists of various fields, each holding specific information or linking keys about BAPI structure project definition data available in SAP. These include DESCRIPTION (PS: Short description (1st text line)), MASK_ID (Selection mask for WBS element short IDs), RESPONSIBLE_NO (Number of the responsible person (project manager)), APPLICANT_NO (Applicant number)... 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. .