Project and activity number variables

[rbuehler-teletrend]

What would be the variables to access the project (and activity) numbers in invoice templates?
Something like invoice['project.number'] seemed feasible, but didn't return a value.
Maybe this can be added to the invoice documentation?

[kevinpapst]

Maybe this can be added to the invoice documentation?

Yeah, after I added it to the next release 😁
And it will be project.number and activity.number