PROJ_UPD_VS2VS 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 "Fields from PROJ (sim.vers.) NOT relevant to the update" 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_PROJ_UPD_VS2VS TYPE PROJ_UPD_VS2VS.
The PROJ_UPD_VS2VS table consists of various fields, each holding specific information or linking keys about Fields from PROJ (sim.vers.) NOT relevant to the update data available in SAP. These include MANDT (Client), PSPNR (Project definition (internal)), PSPID (Project Definition), OBJNR (Object 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. .