minimum by product & minimum by role

i have a stockis role . the default item for purchase is 15 unit.
i have 1 product that allow minimum purchase 1 unit.
if i upgrade to pro can the system overwrite the minimal purchase unit as 1 instead of 15 for this product
my concern is when stockis role only add two item (the specified item with min purchase 1 unit) but system giving up error minimal purchase 15.