Incorrect/missing error message about measurand

[xmacan]

Go to Templates -> Reportit->edit any template-> create a new measurand.
Create any with error (calculation fromula = xavg(maxRRDValue)) -> create. You will see error message "Save failed" and calculation formula is empty.

now go to Templates -> Reportit->edit template again-> you will see warning "action failed - invalid characters: xavg"