These options change the sorting of the grid on the Detail tab. If you have multiple events for the same day where there are supply orders replenishing stock and demand from order requirements or requisitions, you can select which events you would like to view first.
Sorting by "Supply, Then Demand" (default), allows you to view the supply orders replenishing stock first then the demand using stock from the part's available stock.
Sorting by "Demand, Then Supply", allows you to view demand using stock from the part's available stock first, then the supply orders replenishing the part's stock.
These options provide you with the ability to predict shortages of stock where there are multiple events occurring on the same day.