How can I substract a stock item from the total stock of that same item from my oldest date ? Secondly, if my stock from my oldest date is not enough, how can I substract from my second oldest date ?
E.G. If my stock article Crunch on 1 dec 2003 = 20, and on 15 dec = 5.
On the 20th I will use 30 crunches.
So how can I substract from my first oldest and second oldest date ?
E.G. If my stock article Crunch on 1 dec 2003 = 20, and on 15 dec = 5.
On the 20th I will use 30 crunches.
So how can I substract from my first oldest and second oldest date ?