After creating a finished good that has a formula including a By-Product, and production order was completed and status set to "End", then the system generated Rounding variance for the By-Product item amount, and there is no documentation on clarifying the reason why the system generating Rounding Variance when there is a substitution variance was generated at the same time.

Please provide us with a documentation clarifying and explaining why the system calculates rounding variances because the by-product value is included in the rounding variance amounts. This can result in large movement amounts on the rounding variance account over time, which is not typical.