A manufacturing user enters a BOM but forgets to assign a cost ratio. How will this affect production costing, and what action should be taken?

I created a BOM for manufacturing but forgot to assign the Cost Ratio. Will this affect the production costing?

Yes, it can affect the production costing. Without a Cost Ratio, the BOM cost allocation may not be accurate.

What should I do to correct this issue?

You should edit the BOM and enter the correct Cost Ratio (Percentage). After saving the BOM, the production costing will be calculated correctly.