How to set default value in one field depending on other field.

Hi,
I have one requirement.That is..One seede page having 2 field, one is Lov Input field and one more message choice filed.
Requirement is after selecting value in Lov input field need to set one default value in to Message choice field. how to do this one.pls send any sample code for this requirement.
Thanks in Advance,
Hanimi...

Hi,
I used following code
OAMessageLovInputBean lovbean=(OAMessageLovInputBean)webBean.findIndexedChildRecursive("AssetNumber");
OAMessageChoiceBean Choicevalue=(OAMessageChoiceBean)webBean.findIndexedChildRecursive("EamWrPriority");
if (pageContext.isLovEvent())
String lovInputSourceId = pageContext.getLovInputSourceId();
if(lovInputSourceId.equalsIgnoreCase("AssetNumber"))
if(lovbean!=null)
String slovVal=(String)lovbean.getValue(pageContext);
String prValue = getPRValue(pageContext.getApplicationModule(webBean).getOADBTransaction(),slovVal);
//String prValue = "1";
Choicevalue.setValue(pageContext,prValue);
}// end of processFormRequest
private String getPRValue(OADBTransaction con,String slovVal)
// System.out.println("In WorkRequestDffCO.getContextValue.organizationID" + organizationID);
String prValue = null;
String sql = "select decode(ml.meaning,'AC1',1,'AC2',1,'AC3',3,'AC4',3,null) from FND_LOOKUP_VALUES_VL ml ,mtl_serial_numbers msi where ml.lookup_type = 'MTL_EAM_ASSET_CRITICALITY' and msi.ASSET_CRITICALITY_code = ml.lookup_code and msi.serial_number = 'slovVal' ; //'30AC-TR002B'"
Statement st = null;
ResultSet rs = null;
try
st = con.createStatement(1);
rs = st.executeQuery(sql);
if(rs.next())
prValue = rs.getString(1);
catch(Exception e)
e.printStackTrace();
finally
try
if(st != null)
st.close();
if(rs != null)
rs.close();
catch(Exception e)
e.printStackTrace();
return prValue;
Query is executing but no value is retuning, if i use hard coded value in where condition like '30AC-TR002B' it is tt's returning value .

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