MM error - Deficit of PU IR

Dear experts,

I am facing an error when doing GR reversal as follows

Deficit of PU IR quantity xxxxx PC

the below solutions from the forums did not help.

- Check the stock type from which you are doing reversal. Example. from Quality inspection or Unrestricted stocl. Make sure in which stock quantity available. Try to reverse the stock from available stock type.

- pls check if the GR quantity is less than the reversal quantity.

Pls advice what more can be checked. Thanks in advance.

JP