Tonumber on 4-digits number gives #ERROR (BO 4.1 SP03)

Hi Guys,

I have a strange problem.

While using some Input Controls and formulas, I had to return a value from variable created as a number.

I have 3 variables, 1 for Month, 1 for Quarter, 1 for Year.

I return the month\qt\year in the following structure:

"ToNumber([Month])" (Same for QT and Year).

This works well on month and qt, but somewhy Year is giving #Error.

So I tried some things, and got to the conclusion that 4-digits number doesn't work well with "ToNumber".

my problem is I can't do "Formatnumber" inside the "tonumber" because my variable is sometimes Text and it doesn't work.

Any suggestions for by-passing the issue when trying to make "tonumber" on 4-digits?

(I tried creating blank cell with the value "=Tonumber(1000" - Got error as well)

Thank you very much,

Or