How about <dtml-var bcs null=0>? (Just a guess, but I would expect a zero length 
string to be an
invalid integer value).

> I am using the Znolk Input Wizzard with postgresql tables.  One of the
> variables in the table is an integer and can have null values.  However, in
> the update and insert forms, if I attempt to leave the value null, I get the
> following error from Zope:
> "Invalid integer value for weight.bcs"
> The variable is defined throughout as :<dtml-var bcs null="">

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