CUstomers would like to be able to give a price per tonne for feed deliveries as they come in, and for the price of the feed to then adjust when they start using it.
For example:

well, if the system knows that, say:

1st of August : 30 T of corn arrives (160/T)

 

and on the 1st of October, another 40T of corn arrives, this time 170/T

 

When the second delivery arrived, the total amunt of corn is 50 T, but the system waits until the stock of corn is down to 40T (the last delivery), before it changes the price to 170/T

 

I'm sure there are programmes out there that can do this kind of First In/ First Out calculations.

 currently, they have to guesstimate when they have run out of one delivery of feed, then go in and change the price manually in the system so the price correspondes to what they are effectively using