Purchase Account does not Clear When Posting Invoice

Sheina

We use standard cost to cost all items. We revise our Standard costs at year end. If we have a credit memo that is received from a vendor after a stdandard cost change has occurred, Inventory is credit for the cost at the current standard, and the purchase account is debit for this amount. The Credit memo then credits the purchase account and debits a/p for the value of the Credit memo. Leaving a balance in the purchase account. The difference should be posted to the purchase variance account but it is not. Is there anyone else experienceing this problem and if so how are you dealing with it?

Thank you for your help.