JDE Manufacturing Entry reversal steps/ process

Hi All,

Product & Version : JD Edwards 9.2

We our doing process manufacturing in our company and follow the process of GRN Raw materials -> Issue material in Work Order -> Process the WO (involving IM & IC entries) -> WO Completion.

But when there is a change required in the GRN or in the issued material level, we are unable to do a reversal of the manufacturing entry or do a negative WO completion. It appears to be due to a set of missing set ups. Hence would like to get enlighten on below point from your valuable knowledge.

1) In general what would you suggest to do when you get a request to do a change in the GRN or issue material in a WO after the manufacturing accounting is also completed.