To find the optimal balance turnover days for all the single products under each supplier in the current state.
Products below this number of days will all be aligned to the balance turnover days by adding replenishment volume, and products above this number of days will remain unchanged.
And making the total replenishment quantity of each single product to be an integer multiple of its own specifications.
And making the sum of the final replenishment number of all single products ordered by the supplier exactly equal to the minimum order quantity of the supplier.
And as much as possible to reduce the number of searches for the optimal balance turnover days to speed up the calculation.