Inventory Batch Postings

We just converted to 11.5.10 from 11.5.9 less than 2 weeks ago. A member of our Finance team has a question concerning inventory batches which make reference to "old" calendar dates. Only 3 of our inventory orgs are affected (we have 76 in total) and the common thread is Purchasing transactions - PO receipts/deliveries to inventory (and corrections to those deliveries) and Return to Vendor/Supplier from inventory.

Here's an example. The jrnl_name is "MTL USD 20-MAR-12" and the record points to a Purchase Price Variance account. Through research, I found:

PO was created June 11 in USD currency (our functional currency) and the PO price was less than the material portion of the standard cost. The item purchased was mastered in Oracle May 10 and the prices/cost remained stable.