Are you batch managed? If so post the batches to restricted batch status instead of blocked or unrestricted?
A second option is to make a new UD code like "REV", (under review), or "NCR". These would have no automatic stock posting behind them. Use them for making the UD and just leave the stock in QI until you complete the investigation. Then come back via QA12 and change the UD code to the final UD code based on the investigation and post the stock appropriately.
Base the QM metrics on the day the UD code is made, (which is probably what you are doing now). The UD codes can be displayed in the QA32/33 worklists and give you visibility to the those lots with a "NCR" UD code.
Craig
