PCA_AR_AP 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 "EC-PCA: Transfer Payables/Receivables" 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_PCA_AR_AP TYPE PCA_AR_AP.
The PCA_AR_AP table consists of various fields, each holding specific information or linking keys about EC-PCA: Transfer Payables/Receivables data available in SAP. These include PPRCTR (Profit Center), RASSC (Company ID of trading partner), HKONT (General Ledger Account), KOART (Account Type)... 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. .