Field help (LIKQTY2) 

This field displays the quantity of this component in the stock unit that is needed to make the parent product. The default quantity is calculated from the entered quantity using the UOM-STK coefficient (field BOMSTUCOE). You can amend it if necessary.

The sum of the link quantity of each component must equal 100 if the defined management unit (field QTYCOD) for this BOM is Percentage.

 By-products are excluded from the total percentage calculations.