Need to clear inventory valuation of valuation type = Expense

Summary:

Need to clear inventory valuation of valuation type = Expense.

There are transactions which are falling under past months like January and the periods are closed for all past months except April. So if I do a reversal transaction what is the approach to be followed?

a. Create inventory Transaction so as to reverse the transaction with valuation type = Expense with transaction date for reversal as current sys-date as previous months have been already closed.

b. Create inventory Transaction so as to reverse the transaction with valuation type = Expense with transaction date for reversal as same month on which original transaction has happened but by reopening the closed periods if it permits.