"Application module is not a root app module but has no parent"

This is to follow up on my answered question on rootAN substitution
Re: "login session has expired" after am substitution
I am working on an OAF extension.
I have a new LOV region. I extended (to be substituted) the seeded VO, call it xxVO. And I have three custom methods using this xxVO that are called from processFormRequest of my controller which extends the seeded controller.
So putting these methods in rootAM and AM substitution didn't work as some folks pointed out.
So I created xxAM (extends root AM), put xxVO in xxAM’s data model and put my methods in xxAM, set this xxAM as AMDefinition for my custom LOV region.
In my controller I do
OAApplicationModule xxAM = new xxprg.oracle.apps.icx.por.req.server.xxprgRequisitionAMImpl();
But I am getting
=> oracle.apps.fnd.framework.OAException: oracle.jbo.InvalidOwnerException: JBO-25301: Application module is not a root app module but has no parent
at
xxAM.invokeMethod("handleChangeRequester", parameters);
I found a few posts on the same topic. One advise was to not instantiate ‘new’ AM but do something like this
Xo2cAcctOviewExtAMImpl amExt = (Xo2cAcctOviewExtAMImpl )pageContext.getApplicationModule(webBean);
In this example I am confused about the fact that ‘getApplicationModule(webBean);’ which is used in the signature of the processFormRequest will return a ‘rootAM’, is this correct?
There was another workaround mentioned in other posts to not use xxAM at all but build a class to mimic an xxAM passing all needed values that custom methods require. In which case how(or better where) do I instantiate xxVO since now xxVO won’t be part of any AM data model?
Can someone please clarify.
Thank you
Anatoliy

Pratap,
Thank you for the response.
The reason I need to use new xxCO on the page is this.
Seeded page CheckoutLinesPG.
It has advanced table on it where every column has it's one external region.
The new LOV region xxRN is put on a page also under this table new column.
1. When a requester (seeded region on the seeded page) is changed then my xxLOV should reflect the change and be populated according to what is selected in the Requester LOV.
2. When one-time address is added (another seeded region on the seeded page) my xxLOV should be disabled, when one time address taken out - enabled again.
So xxCO should apply to the whole page.
The VO behind advanced table PoRequisitionLinesVO is extended with 2 additional attributes and will substitute, the new xxVO is under xxAM data model.
All works fine with my methods in the seeded RequisitionAM which I get a handle to in the xxCO. But I don;t know how to get the handle to the xxAM if I put my methods there.
Thanks,
Anatoliy
P.S. just fyi - I know it is not the recommended approach but what I did for now I put all calls into the controller - in the controller I can get a handle to root AM, through that I am getting a handle to xxVO which (!) is substituted during runtime with my xxVO. But if you can figure out how to get a handle to xxAM in my case it will be great.
Edited by: asmirnov on Mar 24, 2009 2:04 PM

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