SelectOneMenu dropdown list Validation Error

I've been trying to get a selectOneMenu working properly for a while now. I've added a "blank" value at the top, but it seems to be causing me a lot of problems.
If I click the "Cancel" button on my page, which navigates away from the current page, I get this error: "Validation Error: Value is not valid" if I've selected "None" from the dropdown list.
Here's my code for my selectOneMenu :
<h:selectOneMenu binding="#{task.dropDownCategoryNew}" id="dropDownCategoryNew" style="position: absolute; left: 576px; top: 480px" value="#{SessionBeanTask.intSelectedValue}">
<f:selectItem itemLabel="None" itemValue="0"/>
<f:selectItems binding="#{task.dropdown1SelectItems}" id="dropdown1SelectItems" value="#{task.task_categoryDataProvider.options['task_category.id,task_category.name']}"/>
</h:selectOneMenu>Does anyone have any idea why this might not be working?
Thanks so much

Alright I got it.
You were perfectly right, I was storing the first item as a string with the value "0". What confused me was that in the HTML source code they all were represented as:<option value="0" selected="selected">None</option>
<option value="1">Sales</option>All I had to do was bind the selectItem to an int value like this:
<f:selectItem itemLabel="None" itemValue="#{task.intNoneValue}"/>Thank you BalusC

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, JOB_ID||DECODE(JOB_ID, 'AC_MGR', '" class="graySelect" disabled="disabled') AS R
But you need to account for differences in browsers...
1) firefox (version 3 from my testing) will not let you select the disabled/grayed out option...
2) internet explorer (version 6 from my testing) WILL let you select the disabled option...it actually then sends in a NULL value for that HTTP POST parameter...so as patrick says you will need to have a page item validation to make sure they didn't submit a gray option (and return an error if they did)...
good luck!

Read-only radio group losing value on validation error

It took quite a while to track this down, but I think I've got it narrowed down properly. I have an APEX form for updating a record in a databse table with a radio group which is conditionally read-only. If that radio group has a value AND is read-only, when the form is submitted and hits a validation error, the value of the radio group is lost.
For example, the radio group SUBMITTED_FOR_APPROVAL is set to Y and is read-only for a given user. That user then changes something else on the form and submits it. However, the form now hits a validation error for some field. When the form reloads with the validation error displayed, all the fields are restored except the read-only radio group which is now blank. If a select list is used with the identical read-only condition, it works fine. Likewise, if a radio group is used, but the read-only condition is removed, it works fine. It is only when it is a radio group and it is read-only, that the value does not appear to be submitted to the session with all the form values whent he form is submitted.
Is this a bug or am I simply missing something?
Apex 3.1.2
Rgds/Mark M.

It's using a shared component LOV cleverly called LOV_YN which consists of a static LOV with
1 Display=Yes, Return=Y
2 Display=No, Return=N
The settings in the LOV section on the item iteself:
Named LOV: LOV_YN
Display Extra values: No Dynamic translation: Not translated
Number of columns: 2 Display null: No
Null display value is blank as is null return value
Item was setup as a radio group and was only converted over to a select list to work around this issue. Let me know what else you need and thanks again.
Rgds/Mark M.

SelectOneMenu dropdown list Validation Error

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