OPA_PLN_PP 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 "Screen Fields for Planning Processor in OPA Overall Planning" 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_OPA_PLN_PP TYPE OPA_PLN_PP.
The OPA_PLN_PP table consists of various fields, each holding specific information or linking keys about Screen Fields for Planning Processor in OPA Overall Planning data available in SAP. These include GJAHR (Fiscal Year), VERSN (Version), AUFNR (Order Number), POSID (Version Number Component)... 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. .