Adjust DMR Cost After Posting - Possible?

We had several DMRs put in at the wrong cost - error not caught until after the DM Credit was issued and posted.

We figured out how to go into AP Adjustments and get the Supplier DM to the proper amount.

Now the problem is with inventory. Example: They took out 1 @173.40 which is actually the cost of 2. I need inventory to be relieved for 86.70 instead of 173.40.

We can open the DMR back up and change the unit price on the Debit/Credit tab but the header tab "Material Cost" still shows 173.40. Anyone know how to get the material cost on a closed DMR corrected?

Jenn