Calendar options greyed out in the Task Information dialog box

[Ben]

I defined a new calendar and I wanted to apply it to a Task, but when I open
the Task Information dialog of the Advanced tab I see that the drop box after
Calendar is greyed out and it does not allow me to change the calendar for
the task. I tried setting various options on and off, but the grey is still
there. Any suggestion as to why this is happenning and how to solve it?

 

[Ben]

I found out what it was. The task duration was defined in edays, so I guess
that Project didn't think that the calendar mattered and it greyed out that
option.

 

[Dale Howard [MVP]]

Ben --

Thank you for troubleshooting your own problem and for sharing the solution
with us.