Updatable property of Calculated Field in ViewObject does not work

Question

Hello,
I have set the Updatable property of some ViewObject attributes to "while new".
In the page those attributes are shown as <af:inputListOfValues> components.
When creating a new row, those components properly appear as enabled and let me insert any values, since the row is new.
However, after a following commit, once the table in the page is refreshed, I still see some components enabled on the row I committed before. This only happens with attributes based on calculated fields, not with those based on real table fields, as if the "while new" property specified on the ViewObject calculated fields was ignored.
Do you know why? Is there a solution or work around?
Below are the ViewObject XML section and the af:component definition based on the attribute.
<ViewAttribute
Name="Cod"
IsPersistent="false"
PrecisionRule="true"
Precision="15"
Type="java.lang.String"
ColumnType="VARCHAR2"
AliasName="COD"
Expression="COD"
SQLType="VARCHAR"
IsUpdateable="while_insert"
LOVName="LOV_Cod">
<DesignTime>
<Attr Name="_DisplaySize" Value="15"/>
</DesignTime>
<Properties>
<SchemaBasedProperties>
<CONTROLTYPE
Value="input_text_lov"/>
</SchemaBasedProperties>
</Properties>
</ViewAttribute>
<af:inputListOfValues id="ilov1"
popupTitle="Search and Select: #{bindings.BLOCK.hints.Cod.label}"
value="#{row.bindings.Cod.inputValue}"
model="#{row.bindings.Cod.listOfValuesModel}"
required="#{bindings.BLOCK.hints.Cod.mandatory}"
columns="#{bindings.BLOCK.hints.Cod.displayWidth}"
shortDesc="#{bindings.BLOCK.hints.Cod.tooltip}"
autoSubmit="true">
<f:validator binding="#{row.bindings.Cod.validator}"/>
</af:inputListOfValues>

Answer 1

Helga,
The question is what does this "require" flag do? We read the book of life (cl_htmlb_inputfield), and see that this flag only controls in the first instance a little red * that is rendered next to the input field. This is a pure visualization for the user of the page.
In addition you can ask that a check be done in the browser. This you can do with:
  <htmlb:inputField  id = "wander"
                     value = "E"
                     required = "TRUE"
                     doValidate="true" />
However, I would not serious recommend this. Now even if you user presses a cancel button, or link, or breadcrumb, or..., the check will still complain.
What we currectly do (and recommend), is to set the required flag on the <htmlb:<b>label</b>/> tag. And then do the actual checking on the server (must be done in anycase). If no value, or not correct, then also set the "invalid" flag, render out error message and redo page.
++bcm