Need a perhaps stupid excel help

[Firefly84]

I am despairing at a normally easy when...then formular at excel 2010.
I changed a list for work with doctors, their adress and subject (I successful used dropdown and sverweis there).
But then there is the problem with the car use.
I did a dropdown with yes and no but then I need the list to show me the distance driven when the car use is "yes".

Formula used: =WENN(I3="ja";SVERWEIS(B3;Arztbesuche!$A$3:$D$23;4;FALSCH);0)

Sorry, that the formular is in German.
WENN is either if or when
SVERWEIS is VLOOKUP
FALSCH is WRONG

Instead of the distance it only wrote #NV.

I really need help until I have to go to work in 2 hours.

[Gonk]

Sad, I have no Excel at home.

My strategy in those kind if cases is to break things down in smaller parts and see what is working. Like

=WENN(I3="ja";1;0)

SVERWEIS(B3;Arztbesuche!$A$3:$D$23;4;FALSCH)

You could also post the error message.

One reason for those kind of things not working is when there is a single values expected but sverweis gives multiple values.

[Nut]

NV means that the sverweis don't find the value of b3 in the column Arztbesuche:a3:a23
Or if this value of b3 is in the list, then the value of Arztbesuche:d... is already NV

Hope this helps - excel is wonderful but sometimes hard to find errors

(Gonk shows a good way to find such errors)