Explain dynamic defaults that refer to calculations

[MartijnR]

Based on some initial findings from a dynamic defaults tester.

Explain that this won't work:

type	name	label	calculation	default
decimal	a		random()
integer	b	Enter		${a}

Because the default calculation takes place only once, and before the regular calculation. Regular calculations are still empty when dynamic defaults are calculated.

Solution is usually to move calculation also to default column if ${a} has to be re-used.

type	name	label	calculation	default
decimal	a			random()
integer	b	Enter		${a}

If {a} is not re-used, it could of course simply be:

type	name	label	calculation	default
integer	b	Enter		random()