Cost of Goods Adjustment Issue

Greetings, Programs!

We're struggling to understand why something that has worked in the past seems to have suddenly stopped working, specifically, Cost of Goods Adjustments. The situation is that an Item was received at the incorrect price and now that the period is closed, we cannot go back and edit the transaction per our company and audit house policies. In the past, we've done Inventory Adjustments to take the Inventory out at the higher cost and then bring it back in at the lower cost addressing the issue. Now, however, that solution does not seem to be working anymore.

We've reached out to NS Support whos solution was simply open the Period, delete the IR and re-receive it, however as indicated previously, this is a no-no for our company. So, I ask...