Distribute amount by quantity does not allow whole number

Hello,

I am trying to distribute the amount for an item by quantity, but item is for some reason not allowing a whole number. It always has a trailing number at the end, unless I do a perfectly even split.

For example, I have 700 quantity and want to split 400-300: it defaults to this 400.003 and 299.997 and I cannot change it

But with a perfect even split it works

Thanks