Attributes selected in query with no column type found! (solved)

Dear JHeadstart Team,
In the view object Editor I have two entity based attributes attrib1 and attrib2
both with type Number. Both have aliases with type number(9,0)
If attrib1 is null I want to have the value of attrib2.
In the expression box I put: nvl(attrib1,attrib2)
When I press the ok button I get the next error message.
"Attributes selected in query with no column type found!
Specifying column-type and precision results in better query performance at runtime.
Do you wish to set default column type for these attributes? "
When I say ok I get the next message:
"An error occurred. Unable to apply all the wizard changes.
Column type cannot be changed for Entity based attribute.
Exception: oracle.jbo.dt.objects.JboExeption."
The details button serves no extra information.
Since both the attributes have the same type I thought the nvl commando should work.
But what does the "no column type found" sentence mean?
regards,
Marcel.
Message was edited by:
user571204

Thanks Jan,
You've put me on the right track.
I found out that this is only possible in the entity object class.
So I have to check my limited java skills.

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[m-1951097]
bq. {color:#808080}By default, SQL Developer uses the JDBC Thin driver. This driver does not recognize the ORA_NCHAR_LITERAL_REPLACE, but the oracle.jdbc.convertNcharLiterals property. Try to add this property to the <SQLDEV_HOME>\sqldeveloper\bin\sqldeveloper.conf file: \\ AddVMOption -Doracle.jdbc.convertNcharLiterals=true \\ Let us know if it helps. I have no time to test myself. \\ {color} \\ {color:#808080} \\ Sergiusz{color}
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