I found the problem and have a workaround now.

The problem is caused by a selection field,
which is a text field, that might be null.
This field can either be
  - null
  - empty string (don't know if this is different from null)
  -'0'
  - 0   (don't know if this is different from the string '0')


I'ld consider this as a bug,
but I'm not sure who's to blame ;-),
  SQLite
     or
 the Delphi wrapper
    or
 my own program

I'll study the datatype page again: http://www.sqlite.org/datatype3.html

Thank you all for your suggestions, which finally solved my problem,
cheers,
Stef Mientki

Kamer van Koophandel - handelsregister 41055629  / Netherlands Chamber of 
Commerce - trade register 41055629



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