PRMPLCS 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 "BW Extraction Structure for PM Planned Costs" 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_PRMPLCS TYPE PRMPLCS.
The PRMPLCS table consists of various fields, each holding specific information or linking keys about BW Extraction Structure for PM Planned Costs data available in SAP. These include FISCYEAR (Fiscal year), FISCPER3 (Posting period), START_DATE (Next planned date), NUMS_ORD (Number of Orders)... 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. .