Extended/substituted Application Module creates error

Question

Hello,
I have created an extension and a substitution of an application module. My goal was to bind an addiditional parameter to a LOV and everything works perfectly fine.
the problem is as follows:
on the page, there is a "Message Lov Input" for countries that seems unrelated to the modified LOV. When there is no substitution, I can click on the icon for the "Message Lov Input", a screen popups and I can select a country. With the substitution in place, when I click on the icon I get an error in the popup screen similar to the one we get when the session expires.
any idea what could be wrong?

Answer 1

Since we donot have a nested AM in this case we need to look for a workaround.
You need to answer the following question,
- are you overriding some method the base AM which alredy binds parameters and you are binding additional parameter and calling super ?
If the answer to the above question is yes then follow the steps mentioned below,
- add a formValue in the base page which has the lov using personalization.
- extend one of the controllers probably the pageLayout one and write a new controller
- override processRequest, call super first and populate the formValue using your API
- use personalization to modify the controller class property and attach your new controller
- In the LOV VO add the new attribute and create substitution
- In the lov table add a new formValue and set the viewAttribute to this new attribute on the VO.
- Personalize the base page again and add a new lov mapping setting the formValue in the base page as the criteriaItem and the form value in the lov table as the lovItem.
This will make sure to bind the new parameter on the LOV VO with the value you populated using your API FND_GLOBAL.RESP_NAME() declaratively :).
This is a slightly roundabout way but this the best alternate approach. Probably if the answer to my earlier question was different then I can suggest any other alternate approach based on your answer.