Work order Reversal After WO Accounting run in Final Mode

Hello,

Can any one help to understand the Manufacturing WO Reversal process in below scenarios:-

1) Work Order Accounting is run in Final Mode & Variance Report in Proof Mode. User identified that a) Material issued were wrong b) Labor Consumed were wrong c) Completed Qty were wrong after reviewing the Variance Report.

Here I would like to know, what process needs to follow (Step by Step) so that the Variances should get correct by reversing the Accounting & then the Completion, Time Enter & then the Material issue.

2) I also want to know, if user has completed the Material Issue, Time Entry, R31422 Accounting of Time Entry & WO Completion. Now he wants to reverse the entire process. Then what would be the step by step process.