Allow us to set FIFO as the main stock allocation priority

We have always used a WMS that if no expiry dates are used, defaults to FIFO for stock allocation.

I have recently found out that Mintsoft actually defaults to the location with the least amount of stock in it, which could be much newer than another location.

I would like the ability to be able to choose to turn this off, so FIFO is the main way for allocating stock.

Most of our orders come through integrations, but sometimes customer place large manual wholesale orders and they select newer stock to give their B2B customers more time to sell the goods. These large orders can then reduce a location down quite a lot and with the above logic, future ecommerce orders will actually pick from the newer stock as the location of newer stock will be smaller and we get left with older stock and on a couple of occasions have had to dispose of the stock for the customer.

This has caused us quite a few issues, especially if we haven't had chance to condense any stock down during busy weeks/months.