Best Practice (if business process allows it) is to enter inventory-affecting transactions at least a day after the revaluation.
The system may post production quantity variances on any of the following causes:
1. Actual component quantity used in the build is different from the standard component required in the assembly item record.
2. Cost Category on component items is different from the cost category used during roll up and revaluation.
3. There are changes in the component member items after the most recent roll up/revaluation.