Re: negative values for EFFORT result in error when switching to column view

[Heiko Schmidt]

On 06.04.20 12:13, Nicolas Goaziou wrote:
> Effort property accepts a specific, and well defined type of value:
> a duration. Such values cannot be negative, as explained in the error
> message.
>
> You may, however, use a different property for your use-case, and apply
> column view on it.
>
> Regards,
This is exactly the reason why I'd love to have negative values for the 
durations. It would open the possibility of doing something like 
"accounting" of time.

I'm working with self defined duration units and it would be of great 
value to be able to calculate the balance for planned and done work 
time. I don't use clocking.

What'd be wrong about having -0:30 h, -30 min, -2.5 h, -3 d or -3 m? 
It'd be an addition no change so there would hoefully be no 
incompatibilities.

Maybe even 3m -3d be or -3m 3d could be of use.

As I see there is org-duration.el - Have the changes to be made only there?

Best Regards