PSHLP_CACHE_DS_ST 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 "Datasets stored in cache for each object" 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_PSHLP_CACHE_DS_ST TYPE PSHLP_CACHE_DS_ST.
The PSHLP_CACHE_DS_ST table consists of various fields, each holding specific information or linking keys about Datasets stored in cache for each object data available in SAP. These include MANDT (Client), PSPNR (Project definition (internal)), PSPID (Project Definition), POST1 (PS: Short description (1st text line))... 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. .