[Zope] Problem with Int properties

[Jochen Haeberle]

Hi,

although I'am working with plone I guess i'm having a Zope-problem 
here...

I created a ZCLass inheriting from Base Document, added some properties 
and added that to the portal_types. There are several different 
properties, mainly booleans and some int-files (which drive me nuts at 
the moment).

Everything works fine, you can add my doktype, edit it and things get 
changed except the ints. If I change the values thru ZMI, they will be 
shown in plone correctly (therefore there probably is no bis 
misspelling), changing and submitting will not do anything (neither 
change to selected value nor set to zero always)

Is there anything special one has to do with fields of type "int" I 
might be missing???

thanks in advance

Jochen