I have added a column to put in the number of hours I would expect the task to take each day.
I prefer this to having to work in percentages of a day and think this will be easier to request of my team.
To allow this I need to put a formula in Resource % Allocation column to divide the number of hours by the number of hours in a day. [=hours/7.5]
But as soon as I go into project settings and set the calculated column as the Resource % Allocation column it removes the formula and replaces it with the result. Changing the number of hours then has no effect on that value.
So... How do I make a calculated value the Resource % Allocation column?