I am creating an attachment , so trying to create record in ir.attachment table , iam getting the error as TransactionRollbackError: could not serialize access due to concurrent update CONTEXT: SQL statement "SELECT 1 FROM ONLY "public"."res_users" x WHERE "id" OPERATOR(pg_catalog.=) $1 FOR SHARE OF x"

2013-08-01 12:59:37,768 15674 INFO capital_19jul openerp.osv.osv: SERIALIZATION_FAILURE, retry 1/5 in 0.8138 sec...

how can i solve the issue