Defines if the base_price of maching quantity step should be used as unit price for all items (value is False), or if it applies only to items of the range (value is True).\n
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If this property is set to True, the base_price will be calculated as such :\n
if 0->10 products cost 10$, and 11->infinity products cost 9$, in a command of 15 products, the unit base price is 9.6667$, as the 10 first products cost 10$, and the 5 others cost 9$ (and (10*10+5*9)/15 = 9.6667)
<value><string>A per unit base price applying to the products whose quantity is in slice. This per unit base price will be weighted with the per unit base price of other slices.\n
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This property is useful for the following case :\n
0-10 products cost 10$, and 11-inf products cost 9$. Thus in a command of 15 products, the unit base price is 9.6667$, as 10 * 10 + 5 * 9 = 145, and 145 / 15 = 9.6667</string></value>
