Question to Matarialized View "staleness" parameter

Question to all Oracle database experts.
IFS Applications uses Materialized views (MV'S) for Business Intelligence reporting.
Some of this MV's never gets the staleness status "FRESH", but is allways in status "unknown".
Folling MV is an example;
CREATE MATERIALIZED VIEW SUPPLIER_MV
REFRESH COMPLETE ON DEMAND
AS
SELECT a.supplier_id id,
a.supplier_id code,
a.supplier_id supplier,
a.name supplier_name,
a.country country,
a.creation_date creation_date,
a.association_no association_no,
a.default_language default_language,
a.suppliers_own_id suppliers_own_id,
a.corporate_form corporate_form,
Corporate_Form_API.Get_Corporate_Form_Desc(a.country, a.corporate_form)
corporate_form_desc
FROM SUPPLIER_INFO_TAB a
UNION ALL
SELECT '#' id,
'#' code,
'#' supplier,
'' supplier_name,
'' country,
to_date('0001-01-01','YYYY-MM-DD')
creation_date,
'' association_no,
'' default_language,
'' suppliers_own_id,
'' corporate_form,
'' corporate_form_desc
FROM BI_DUAL_TAB;
Any one, any idea how to update the status correct?
Regards
Gunnar B Melby
IFS, Norway

Supplier_MV has following properties;
Proporty value
OWNER     IFSAPP
MVIEW_NAME SUPPLIER_MV
CONTAINER_NAME SUPPLIER_MV
QUERY_LEN 1552
UPDATABLE     N
REWRITE_ENABLED     N
REWRITE_CAPABILITY     NONE
REFRESH_MODE     DEMAND
REFRESH_METHOD     COMPLETE
BUILD_MODE     DEFERRED
FAST_REFRESHABLE     NO
LAST_REFRESH_TYPE     COMPLETE
LAST_REFRESH_DATE     01.07.2010 10:25
STALENESS     UNKNOWN
AFTER_FAST_REFRESH     NA
UNKNOWN_PREBUILT     N
UNKNOWN_PLSQL_FUNC     Y
UNKNOWN_EXTERNAL_TABLE     N
UNKNOWN_CONSIDER_FRESH     N
UNKNOWN_IMPORT     N
UNKNOWN_TRUSTED_FD     N
COMPILE_STATE     VALID
USE_NO_INDEX     N
TABLE_NAME     SUPPLIER_MV
MASTER_OWNER     IFSAPP
MASTER     BI_DUAL_TAB
CAN_USE_LOG     NO
REFRESH_WITH     COMPLEX
LAST_REFRESH     01.07.2010 10:25
ERROR     0
FR_OPERATIONS     REGENERATE
CR_OPERATIONS     VALID

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