Discoverer report returns no data from a certain time

Question

Using Discoverer 10g,a discoverer report which returned data normally last month gets to return no data now.
We have four same environments, and two of them has this problem, two is OK.
And the SQL of the discoverer of the four environments are the same.
We have no any changment of this discoverer and related EUL for more than one year....
How should we investigate into this issue.
For example ,a point we should notice or something...
Could somebody give us a suggestion?
Thank you.

Answer 1

Thanks for your qiuck reply.
1.empty table that is joined in the query.The four environments has almost the same data,it is not the cause.
2.security issue with the data, maybe the security definitions are different from one environment to another.we are now invesgate into this cause.
and there is a sql of the discoverer's EUL which shows no data in a enviroment(in this enviroment discoverer report gets no data), but in another enviroment data can show.
the sql is as following.
=============
SELECT loc_bu.org_id
,loc_bu.location_id building_id
,loc_bu.building building_name
,loc_bu.location_code building_number
,loc_fl.location_id floor_id
,loc_fl.location_code floor_number
,loc_fl.floor floor_name
,loc_of.location_id office_id
,loc_of.location_code office_number
,loc_of.office office_name
,loc_of.suite office_suite
,loc_of.location_alias office_alias
,loc_of.assignable_area office_assignable_area
,loc_of.space_type_lookup_code office_space_type_code
,lst.meaning office_space_type
,loc_of.function_type_lookup_code office_function_type_code
,fun.meaning office_function_type
,(SELECT ffv.description
FROM fnd_flex_values_vl ffv
,fnd_flex_value_sets ffvs
WHERE ffv.flex_value = loc_of.attribute1
AND ffv.flex_value_set_id = ffvs.flex_value_set_id
AND ffvs.flex_value_set_name = 'MB_PN_ON') occupancy_exception_flag
,loc_of.active_start_date
,loc_of.active_end_date
--ADD BY KEVIN 2008/6/26 START
,loc_of.attribute7 division_code_office
,(SELECT ffv.description
FROM fnd_flex_values_vl ffv
,fnd_flex_value_sets ffvs
WHERE ffv.flex_value = loc_of.attribute7
AND ffv.flex_value_set_id = ffvs.flex_value_set_id
AND ffvs.flex_value_set_name = 'MB_PN_DIVISION') division_description_office --ﾇﾖ-ﾎ・ﾋｵﾃ・
--ADD BY KEVIN 2008/6/26 END 
FROM pn_locations loc_bu
,pn_locations loc_fl
,pn_locations loc_of
,fnd_lookups fun
,fnd_lookups lst
WHERE loc_bu.location_id = loc_fl.parent_location_id
AND loc_bu.location_type_lookup_code IN ('LAND', 'BUILDING')
AND nvl(loc_bu.attribute6, '99') <> '01'
AND loc_fl.location_id = loc_of.parent_location_id
AND loc_fl.location_type_lookup_code IN ('FLOOR', 'PARCEL')
AND nvl(loc_fl.attribute6, '99') <> '01'
AND loc_of.location_type_lookup_code IN ('OFFICE', 'SECTION')
AND nvl(loc_of.attribute6, '99') <> '01'
AND loc_of.function_type_lookup_code = fun.lookup_code(+)
AND fun.lookup_type(+) = 'PN_FUNCTION_TYPE'
AND loc_of.space_type_lookup_code = lst.lookup_code(+)
AND lst.lookup_type(+) = decode(loc_of.location_type_lookup_code,
'OFFICE',
'PN_SPACE_TYPE',
'SECTION',
'PN_PARCEL_TYPE')
AND nvl(loc_of.space_type_lookup_code,'99') <> '07';
====================
Ps.before excute this sql, we always first excute following command.
====
begin
fnd_client_info.set_org_context(117);
end;
====
The analyst of our team is not very good at the security problem, could you help us?
Thanks a lot.