Note : Take the complete back up of the application before performing the below steps.Follow the steps below to take the back up.
Connect to the database and execute the delete query .
Instructions to connect to the MYSQL DB is present in the link given below.
DELETE FROM arc_workorder WHERE workorderid IN (request ids separated by comma);
For mssql , execute the below query using query analyzer.
DELETE FROM arc_workorder WHERE workorderid IN (request ids separated by comma);\
Thanks,
K. Andrew Navin