I am seeking votes for the following that has become an issue for us.
Where a task has existing hours added to a billed billing record, it would be useful to see a warning appear if the Revenue Type field is later changed from User Hourly to Not Billable.
Our current workaround is to run a report to capture these instances. Conversations are then had with the Project Owners to understand the intention and review consequences.
Idea: Revenue Type Warning (workfront.com)
