Hi Vicky,
As Hareesh mentioned above i hope you searched the system errors for all the years in database overview.
If you still don't find any errors in database overview then ask basis guys to run a query on BC_MSG table. (SELECT * FROM BC_MSG WHERE STATUS = 'NDLV')
If they have access to Open SQL Data Browser in NWA, they can check it there.
Open SQL Data Browser - Process Integration - SCN Wiki
Regards,
Praveen.