Field help (FOCBKT) 

If the maximum quantity for the free product allocation is entered, the number of free products will be multiplied by the number of bands.
The quantity corresponding to the band is in theprice list unit
For instance:
- free item minimum: 10
- free item band: 5
- Free product: KDO
- free quantity: 2
If the quantity sold is 22, there are 4 free KDO.