Indicate the Nature of Each of the Situations Described Below

Indicate the nature of each of the situations described below using the following three-letter code.
CODE DESCRIPTION
CPR: Change in principle reported retrospectively
CPP: Change in principle reported prospectively
CES: Change in estimate
CRE: Change in reporting entity
PPA: Prior period adjustment required
____ Change from FIFO inventory costing to LIFO inventory costing.
____ Change from LIFO inventory costing to FIFO inventory costing.
____ Change in the composition of a group of firms reporting on a consolidated basis.
____ Change to the installment method of accounting for receivables.
____ Change in actuarial assumptions for a defined benefit pension plan.
____ Change from sum-of-the-years' digits depreciation to straight-line.
____ Change from expensing extraordinary repairs erroneously recorded as an expense to capitalizing the expenditures.
____ Change in the percentage used to determine warranty expense.
____ Change from reporting postretirement benefits according to the provisions of U.S. GAAP.
____ Change in the residual value of machinery.