Production Yield

Does anyone have Production Yield setup in E9?
We have recently set it up on just 1 operation so we can track the changes easier while we figure out how it works.
We are trying to find out how to get it to recalculate to the correct amount if the labour quantity was entered wrong then corrected through time and expense after production yield has recalculated. We tried running the recalculation process again after the change was made and it didn’t make a difference.
Also, is there any way to see an audit trail of the recalculations made?
Any help would be greatly appreciated

No responses since Nov '17. Does anyone use this process? in E10?

looking for some help on this too