R12.0.5 : POXPOVPO.fmx didn not generate successfully -

Hi,
When attempting to apply while patches 8478486, 9228587,
the following error occurs.

ERROR
-----------------------
ERROR generating form "forms/US/POXPOVPO.fmx" from input file
FRM-30064: Unable to parse statement select  nls_language,language_code from fnd_languages fl ,po_vendor_sites_all pv  where
fl.nls_language  = pv.language and pv.vendor_site_id = :headers_folder.vendor_site_id
union
select nls_language ,language_code  from fnd_languages fl where
fl.language_code = userenv('LANG').
ORA-00918: column ambiguously defined
Record Group LANGUAGE
Form: POXPOVPO
FRM-30085: Unable to adjust form for output.
-------------------------------------------------------------------------


Forms version :
adident Header POXPOVPO.fmb
POXPOVPO.fmb:
                                 $
$Header POXPOVPO.fmb 120.17.12000000.7 2007/10/18 01:58  ankugarg noship