How to update bulk records in Siebel using eScript?

The best suggestion anyone can give to update records in bulk in Siebel is to use Siebel EIM. However sometimes developers don't have time to create EIM job, test it in lower environments and get it working in some days, and business can't wait for that long, And pesky admin team won't give developers the SQL access to production.

Then this is the last solution. Write a dirty little script and run it in business service simulator.