How to make default selection blank for SelectOneChoice component

Query 1
I have a JSF page having databound selectOneChoice on an attribute of ViewObject. The attribute LOV configuration has the List, Return Value set with the same value. UI Hints --> Choice List Options is checked for "Include No Selection Item" with "blank Item First to List" from drop down. When JSF loaded, default selected item does not appear to be blank. I expect that No Select Item should be selected by default. Do let us know if anything specific to be done for this?
Query 2
I have a JSF page to which taskflow containing a single jsff draged as region. On submit of JSFF form, all the read-only text-fields on jsff are getting blank. I want to retain the values of read-only fields on jsff. Please advice.

This is in reference to Jdev 11g, using jspx's in adfc-config..
If your selectonechoice is like this,
            <af:selectOneChoice value="#{bindings.SolutionUnit.inputValue}"
                                label="Cost Centre">
              <f:selectItems value="#{bindings.SolutionUnit.items}"/>
            </af:selectOneChoice>The selected value depends on what is retruned by the 'value' property of your component. If my #{bindings.SolutionUnit.inputValue} returns a null value or a value which is not present in <f:selectItems value="#{bindings.SolutionUnit.items}"/>, then I will get a blank row selected...
haven't worked much with regions, so..

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