[EpiData-list] NOENTER? SKIP? Ifthen?

Hi

I am a begginer in EpiData. I don't understand the syntax for doing the following task in the check file:

If var1 = 1 , then I need the field of var10 in the "data entry form" to be locked.

How do I do this?

I tried: var10 BEFORE ENTRY IF (var1=1) THEN HIDE var10 ENDIF END END

But it does not work

Thanks for your help

Kristian