Multi-Org Parent-Child LOV

Question

Issue Description:
in Action BC (Table: S_EVT_ACT) we are trying to implement the following organization based parent child picklists/LOVs for Status->Status Reason
[Status] - Activity Status field (col: EVT_STAT_CD)
*Picklist: LOV Type = 'EVENT_STATUS', picklist BC: 'List Of Values Dynamic (REL)'
[LN Status Reason] - customised field/column (Col: X_STATUS_REASON)
*Picklist: LOV Type = 'LN_MISSED_ACTIVITY_REASON', picklist BC: 'PickList Hierarchical'
*Pick Map: [LN Status Reason] = [Value], [Status] = [Parent] (Constraint = Y)
in the Admin-Data LOVs:
Type = EVENT_STATUS, Display Value/LIC = "Not Achieved", Organization = "Org 1"
Type = LN_MISSED_ACTIVITY_REASON
Display Value/LIC = "Reason 1", Parent LIC = "Not Achieved", Organization = "Org 1"
Display Value/LIC = "Reason 2", Parent LIC = "Not Achieved", Organization = "Org 1"                                                                                          
On UI, create new record in Account - Activities, selecting Status = "Not Achieved".
Now when i try to select the Status Reason value, the drop down does not give me any value.
If I set the Organization to blank on "Reason 1", then the "Reason 1" value shows up in the Status Reason drop down under Account - Activities.
In SQL of the log file, for the Status Reason drop down, it always hard code a T1.BU_ID is null in the WHERE clause, this would explain why its blank in the dropdown
Also as a test, If i remove all the pick map constraints for the [LN Status Reason] field (ie the only record in the pick map is [LN Status Reason] = [Value]), then the drop down works correctly (ie displaying both the values with Organization = "Org 1"), and in the SQL of the log file, instead of BU_ID is null, it has BU_ID = ? with variable binding.
Is there a reason why it would hard code the BU_ID is null in the WHERE clause in the SQL, and how to overcome this to achieve my requirement.
Just a further update due to character limit of the original description,
The "Owner Organization Specifier" property on the table S_EVT_ACT is blank (not sure if its related to anything though)
The user i'm using belongs to "Org 1" for both the employee's Organization and its Position's Organization
Thanks

Answer 1

This is exactly what I'm looking for...I just can't make it work. I have 2 tables (database and schema). They are related via a database_id column. My code is below if you are willing to help.
HTML Header
<script>
function get_select_list_xml1(pThis,pSelect){
var l_Return = null;
var l_Select = html_GetElement(pSelect);
var get = new htmldb_Get(null,html_GetElement('pFlowId').value,
'APPLICATION_PROCESS=CASCADING_SCHEMA',0);
get.add('P7_DATABASE',pThis.value);
gReturn = get.get('XML');
if(gReturn && l_Select){
var l_Count = gReturn.getElementsByTagName("option").length;
l_Select.length = 0;
for(var i=0;i<l_Count;i++){
var l_Opt_Xml = gReturn.getElementsByTagName("option");
appendToSelect(l_Select, l_Opt_Xml.getAttribute('value'),
l_Opt_Xml.firstChild.nodeValue)
get = null;
function appendToSelect(pSelect, pValue, pContent) {
var l_Opt = document.createElement("option");
l_Opt.value = pValue;
if(document.all){
pSelect.options.add(l_Opt);
l_Opt.innerText = pContent;
}else{
l_Opt.appendChild(document.createTextNode(pContent));
pSelect.appendChild(l_Opt);
</script>
Application Process
BEGIN
OWA_UTIL.mime_header ('text/xml', FALSE);
HTP.p ('Cache-Control: no-cache');
HTP.p ('Pragma: no-cache');
OWA_UTIL.http_header_close;
HTP.prn ('<select>');
HTP.prn ('<option value="' || 0 || '">' || '- All Schemas -'
|| '</option>'
FOR c IN (SELECT schema, schema_id
FROM (SELECT schema, schema_id, database_id
FROM schema_lookup
WHERE database_id = :cascading_selectlist_item_1)
LOOP
HTP.prn ('<option value="' || c.schema_id || '">' || c.schema || '</option>');
END LOOP;
HTP.prn ('</select>');
END;
P7_DATABASE_ID Form Element Attribute
onchange="get_select_list_xml1(this,'P7_SCHEMA_ID');
P7_SCHEMA_ID LOV
select SCHEMA d, SCHEMA_ID v from SCHEMA_LOOKUP
where DATABASE_ID = :P7_DATABASE_ID
order by 1