GM! I have an event script that runs after the record is created but I am occasionally seeing error "Code: RCRD_HAS_BEEN_CHANGED" because of a workflow that runs every 30 minutes which updates a field when its empty... any way to avoid this?

Not really. Change your schedule so it doesn't run every 30 minutes

Have your workflow step be performed as part of your user event

My workflow is for all transaction types whereas this user event script is just for sales orders