Not able to set the where clause params

Question

Hi,
My version of apps is 12.1.3.
I created a page with a searchRN and resultRN (LinesVO). (Not a query/view link) . I am passing the id from header to the VO to restrict the linesVO
The controller correctly passes the id from searchRN to AM, but in AM, the where clause is not set and I am not getting the desired result:
My AM Code:
    public void InvokeGo(String Hdrval)
                LineVOImpl LineVO1 = getLineVO1();
                LineVO1.setWhereClauseParams(null); // Always reset
                 System.out.println("AMIMPL:Hdrval = "+ Hdrval);
                <prints the header_Value which is passed from CO>
                   if (Hdrval           == null        
                                        System.out.println("Inside Null If");  
                                        String message = "Please provide atleast one input to any of these search field";
                                        throw new OAException(message, OAException.ERROR);
                                else   
                                    System.out.println("Not All Parameters are Null.Building Where Clause");
                                     < prints the line above>
                                    LineVO1.setWhereClause
                                    ("Header_name = :1");
                    System.out.println("Paremeter Set are: Header_name:"+Hdrval);
                    <prints the above line like :   Paremeter Set are: Header_name:Hdr_Name_1
                    LineVO1.setWhereClauseParam(0,Hdrval);
                    System.out.println("Inside MainAM invokeGO Method:"+LineVO1.getQuery());
                    < prints:Inside MainAM invokeGO Method:SELECT * FROM (select LINE_ID,hdr.HEADER_ID,LINE_NUMBER,LINE_NAME,Attach,hdr.header_name from xxtr_hdr hdr, xxtr_line line
where hdr.header_id=line.header_id) QRSLT  WHERE (Header_name = :1)>
                    LineVO1.executeQuery();
The issue is in the SQL build. I guess after setting the where clause, it should appear like :
QRSLT  WHERE (Header_name = "Hdr_Name_1"
Thanks

Answer 1

Hu Sumit,
I am doing that:
LineVO1.setWhereClauseParam(0,Hdrval);
before executequery. I even hard coded
LineVO1.setWhereClauseParam(0,"XXXX");
but still it din't work. I guess I am missing something small. because I have done this thing a lot of times earlier and it had worked.