ADF ViewObject Clarifications

Hello,
I'm facing strange behaviours in ADF viewobject. I have a viewobject PropertyView1. I need to list the properties only for a particular user. And also within that , I need to display based on the property status.
So I have a dataaction (DA1) which binds to a app module function ,
ViewObject vo = getPropertyView1();
vo.setWhereClause(" Property.USERID = :1 ");
vo.setWhereClauseParam(0,new Long(uid));
vo.executeQuery();
This sets the view object to display only the properties of a particular user. This DA1 forwards to a datapage (DP1) on "Success", The DP1 contains the ADF Read-Only table for the propertyview1 view instance.
I have another function which should display only the "new" properties for a particular user.
Another data action (DA2) which contains the function,
ViewObject vo = getPropertyView1();
vo.setWhereClause(" Property.PROPSTATUS = :1 and Property.LAGENT = :2 ");
vo.setWhereClauseParam(0,status1);
vo.setWhereClauseParam(1,new Integer(uid));
vo.executeQuery();
This displays the user properties which are "New". Similar to the first data action, DA2 -> DP2 on success.
The following Sequence of actions gives strange behaviours every time,
1. Execute the first dataaction (DA1) . It works properly , Provides me with correct list of properties.
2. Execute Second dataaction (DA2). There are no rows which match the criteria. So I get "No Records Found" in Dp2.
3. execute first data action again, It provides me No records found as well as Errors.
The errors are,
" Bind variable does'nt exist"
Somehow there are two bind parameters set for DA1, while there is only one bind parameter in my where clause. And this happens only on the second time. I'm able to ececute DA1 correctly on the first time.
Also, Pelase let me know if I Have two create two view instances for these types of queries. Or Is there a way to revert back to all the rows originally in the propertyview1 view object (The view object has no where clauses in the definition), after executing the DA2 or DA1 dataction. I hope i was clear in the above questions.
Thanks a lot.

Just a guess: call vo.setWhereClauseParams(null) before setting new parameters.
From the VO API Doc:
Note that calling setWhereClause() does not clear the previous settings of WHERE clause parameters. To reset WHERE clause parameters in the middle tier, call ViewObjectImpl.setWhereClauseParams(Object[]) explicitly with a null value. For example:
vo.setWhereClauseParams(null);

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How I can solve it?
What another way I can programmatic pass a parameter to a ViewObject connected to a table?
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Another thing: the used strategy to obtain a binding container is explained by Steve Muench http://www.oracle.com/technology/products/jdev/tips/muench/1013eabinding/index.html:
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Event that is possible, but you need to define "instead of" trigger in db and modify lock() method in EntityImpl class, so this is overkill for your usecase.
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