How to reference a custom property in a vo transient attribute expr + bug

Hi all
I have created a transient attribute with an expression that evaluate null content to replace it by a appropriate text.
<ViewAttribute
    Name="DescriptionUI"
    IsUpdateable="false"
    IsSelected="false"
    IsPersistent="false"
    PrecisionRule="true"
    Type="java.lang.String"
    ColumnType="VARCHAR2"
    AliasName="VIEW_ATTR"
    SQLType="VARCHAR">
    <TransientExpression><![CDATA[((Description == null) ? 'Pas de description' : Description)]]></TransientExpression>
</ViewAttribute>I have defined a custom property for that attribute that contains the message text. I was surprised to see that the custom property was not associate with the attribute in the source file. Don't understand where the association is done
    <Properties>
      <CustomProperties>
        <Property
          Name="flex.tree.noLabel"
          ResId="flex.noDescription"/>
      </CustomProperties>
    </Properties>I had some difficulties to use the custom property editor. When creating a new related one by using an existing resource the property column value is not changed and the content 'Property' is generated. Because no relationships exists between attribute and the property, the entry is lost in the table referring custom property list for the attribute when your come back into the view object or if you save an another entry in an another attribute.
So my first question ? Is the attribute editing part the right part to define custom property pairs if they are not related to attributes ? is it a bug ?
My second question is : is it possible to evaluate the bundle in the expression (replacing the literal 'Pas de description' by an expression) ? What is the expression to use ? Where it is described to do such things in the help or in the documentation ?
Thank you

This is wrong
((Label == null) ? {FlexParameterModelBundle['flex.tree.noLabel']} : Label)
What is the correct syntax to refer to the project model standard bundle in the groovy expression ?
Thank for the help !

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