[Lazarus] Can't create calculated field

[Krzysztof]

I know how to create events (from object inspector and in runtime).
Everything is connected correctly, events are fired but don't know why this
error occur. Calculated fields in Laz SQLDB are different than in Delphi?
I'm doing everything what I did in Delphi. My field is created in runtime
because I get AV when I try to create field in design time (this is other
issue, seems that SQLDB in Code Typhon 3.10 is messed up)
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