webutil.client_ole2

I am using an COM SDK to integrate a third party software with web Oracle forms (10gR1). All the codes below run without error and the search result is also correct. Only the last step doesn't display anything.

 -- create database object

o_db := CLIENT_OLE2.CREATE_OBJ('TRIMSDK.Database');  

              

-- connect to default database
client_ole2.invoke(o_db, 'Connect');                              

-- create a NewRecordSearch object

o_recSearch := client_ole2.invoke_obj(o_db, 'NewRecordSearch');  

-- call AddRecordNumberClause to set search condition - by record number in this case
args := CLIENT_OLE2.CREATE_ARGLIST;
CLIENT_OLE2.ADD_ARG(args, '12345'); 
client_ole2.invoke(o_recSearch, 'AddRecordNumberClause', args );