The stock 11.0 report definition "RD Agent" includes a formula field for Duration. The formula being used for that field is:
DURATION(${agent.agentMRDs.dateTimeLastStateChange})
When I attempt to recreate this field in my own custom report definition, I receive the following error:
"The formula is invalid. Please check online help for best practices."
How can I use the DURATION function as employed in the stock report definition? Is there a source of documentation covering supported functions beyond what is offered in the Report Customization guides?