Field help (QTYCOD) 

The management unit defines the quantity of the BOM links using a basis other than the product unit.
A BOM can therefore be entered for 1 product unit, 100 product units, 1,000 product units, using a percentage or specifying the size of a "lot".
In the percentage definition, the total link quantities must be equal to 100.
The management unit selected determines if the Base quantity field (BASQTY) is initialized or available for entry.