BC4J and UIX: Where to filter MessageChoice?

I have VO based on EO and table STUDY_PHASE (STUDY_ID, STUDY_PHASE_ID, STUDY_PHASE).
So when user logs into the system he/she chooses STUDY_ID and thereafter is able to visit other UIX pages. Some of the pages are UIX Input Forms and the user can select Study Phase from the MessageChoice Component that is 'sourced' with the StudyPhaseView.
My questions is where (not how) to do this in the code? What I did is parametarized VO with 'WHERE studyId = :1' and I am aware of the code:
ViewObject vo = appMod.findViewObject('VOname');
vo.setWhereClauseParam(0, studyId);

Hi
Again I would appreciate if someone can take a look at this post.
I will try to be more specific. I have two VOs:
1. AssignmentVO (AssignId, AssignedTo, StudyId, StudyPhaseId). This VO is based on EO AssignmentEO with the same attributes and this EO is based on a table ASSIGNMENT with, again, same attributes. Clear enough?
2. StudyPhaseVO (StudyId, StudyPhaseId, StudyPhase)
There is no viewlink beetween these two VOs. I just need StudyPhaseVO to be my source for the MessageChoice. Here is where MessageChoice comes into the game:
I have a UIX page that is an input form for adding/editing Assignment information. So the page has entries for AssignId, AssignedTo, StudyId, StudyPhaseId. Actually the page HAS only two input fields (AssignId uses automatic DBSequence for the new records):
- AssignTo as MessageTextInput
- StudyPhase as MessageChoice (HERE IT IS).
I guess I can divide my problem into two:
1. I need to choose StudyPhase from the source view (StudyPhaseVO) and destination is actually TWO fields StudyId and StudyPhaseId which both are needed to passed to the underlaying AssignmentEO.
2. But my set of choices needs to be filtered by StudyId which has been selected in the table on one of the previous pages. I do have a ViewLink available to fetch the record and extract the StudyId.
The question is how and where in the code to use this StudyId so that when UIX input form opens, only filtered values in MessageChoice are displayed. If this is not clear enough please let me know.

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BC4J and UIX: Where to filter MessageChoice?

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