Link between 2 SelectOnceChoice component doesn't work.

Question

Hello all,
I am using ADF BC, with Jdev version 10.1.3.3.
Right now I have the requirement to put 2 SelectOneChoice and 1 table component on a new page.
User select the value in the 1st list box and the value in 2nd list box should change according to the 1st one dynamiclly. After user select the value for the 2nd SelectOneChoice, the table records in the readonly table should also change dyamiclly.
I have find way to link a SelectOnceChoice to a readonly table, that is create a nested query with view-links and drag the master item and nested view to the page. And set the auto-submit and PartialTriggers properies for them.
Right now my question is how to make the dynamic change between the 2 SelectOneChoice? I have search the forum for many threads and it seems the #62 example in Steve Muench's blog should be the similiar solution. The link is http://radio.weblogs.com/0118231/stories/2004/09/23/notYetDocumentedAdfSampleApplications.html#62
I have test the example, it works well. And I also make a new page with the table in hr schema, and make link successful, although a little different from the example:
Create Region EO and RegionView VO(use it to creat regionlist LOV) based on Region table, create Country EO, CountryView VO(use it as base query for the 2 SelectOnceChoice component) and CountriesForRegion VO(use it to creat Country LOV, contains a parameter) based on country table. Then drag region_id and country_id from Data Control Palette to the page and link them to regionlist LOV and Country LOV. Set the 1st SelectOneChoice componnet's ID and autosubmit property and set 2nd SelectOneChoice componnet's PartialTriggers property. Then set the action and revoke action in the page def: use base view's region id as parameter, to create a ExecuteWith Parameters action and create invoke action with renderModel and condition is #{empty requestScope.CountryChanged}
So far it works well and I don't need to add code in the example coz the link has been created.
But when I turn to my table, all the thing changed. I have 2 tables contain process infomation and emp name information.
the process table: processID(PK) and Process name
the emp name list table : processID, UserID(PK) and Name
I create the page as I did in above example, use ProcessID as parameter. But nothing happen when I change the value of 1st SelectOnceChoice.
the where clause in the NameListForProc is: where namelist.PROCESS_ID = :TheProcessID
and it seems not work. when I change to nvl(:TheProcessID,26) nothing happen.
when I change to hardcode decode(:TheProcessID,0,0,26) it can retrive valule in the 2nd SelectOnceChoice. I don't know what happen in this place.
I had suspect the datetype of processID and change number(20,0) to number as in hr tables. nothing happen.
I also change the parameter to use process name, still no value. the returned :TheProcessID is not null, but I don't why it can't retrieve value as I did in the hr example.
So I wonder what will impact this process? some setting of VO or some setting in action and revokeaction or some properties or I misssing something in the steps?
can any one give me some hint? many thanks.
Scott

Answer 1

The SelectOneChoice section is:
<af:selectOneChoice value="#{bindings.ProcessId1.inputValue}"
label="#{bindings.ProcessId1.label}"
autoSubmit="true" id="ProcList"
showRequired="true">
<f:selectItems value="#{bindings.ProcessId1.items}"/>
</af:selectOneChoice>
and the binding list:
<list StaticList="false" ListOperMode="0" IterBinding="NameViewIterator"
ListIter="ProcessListIterator" id="ProcessId1" NullValueFlag="1"
NullValueId="ProcessId1_null">
<AttrNames>
<Item Value="ProcessId"/>
</AttrNames>
<ListAttrNames>
<Item Value="ProcessId"/>
</ListAttrNames>
<ListDisplayAttrNames>
<Item Value="ProcessName"/>
</ListDisplayAttrNames>
</list>
Do I need to change the format of SelectOneChoice to add "for each"?
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