This forum is to discuss different features/issues of Oracle Financials modules ( GL - General Ledger, AP - Accounts Payable, AR - Accounts Receivable, FA - Fixed Assets & CM - Cash Management ).
You cannot adopt 2 accounting methods at the same time..
You simply adopt accrual basis accounting method and then u can record all kind of transactions whether accrual or cash. Read some text on accounting methods concept then your query will be solved.