SQL & PL/SQL

hi all I want to update portal.WWDOC_DOCUMENT$ fields manually. Specifically the fields blob_content and last_update.
When i update the blob_content it is ok.

When i execute update

update portal.wwdoc_document$ set last_updated=sysdate where filename like '2%.xml' i get error


java.sql.SQLException: ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "PORTAL.WWCTX_SSO", line 1810

ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "PORTAL.WWCTX_SSO", line 1644
ORA-06502: PL/SQL: numeric or value error
ORA-06512: at "PORTAL.WWCTX_SSO", line 1973
ORA-06512: at "PORTAL.WWCTX_API", line 279
ORA-06512: at "PORTAL.WWERR_API_ERROR", line 99
ORA-06512: at "PORTAL.WWERR_API_ERROR", line 222
ORA-06512: at "PORTAL.WWERR_API_EXCEPTION", line 63
ORA-06512: at "PORTAL.WWV_THINGDB", line 1446
ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "PORTAL.WWCTX_SSO", line 1810
ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "PORTAL.WWCTX_SSO", line 1644
ORA-06502: PL/SQL: numeric or value error
ORA-06512: at "PORTAL.WWCTX_SSO", line 1973
ORA-06512: at "PORTAL.WWCTX_API", line 279
ORA-06512: at "PORTAL.WWERR_API_ERROR", line 147
ORA-06512: at "PORTAL.WWERR_API_ERROR", line 305
ORA-06512: at "PORTAL.WWSBR_STDERR", line 27
ORA-06512: at "PORTAL.WWSBR_SITE_DB", line 2270

ORA-06510: PL/SQL: unhandled user-defined exception

ORA-06512: at "PORTAL.WWCTX_SSO", line 1810

ORA-06510: PL/SQL: unhandled user-defined exception

ORA-06512: at "PORTAL.WWCTX_SSO", line 1644

ORA-06502: PL/SQL: numeric or value error

ORA-06512: at "PORTAL.WWDOC_DOCU_BRU_TRG", line 112

ORA-04088: error during execution of trigger 'PORTAL.WWDOC_DOCU_BRU_TRG'


What should i do? I call the update from a java servlet.
The blob_update works fine. the last_update doesn't work

Thanks in advance from your help

Regards,

Antonis