@evelynyim Out of the box, there is not a way to prevent more than one report per month.
You would need to add the Report Start Date and Report End Date to the report header than create an audit rule based on these fields and one based on Dates Overlapping. This is the closest you can get. Also, educating your users will go along way.
To create the two audit rules I referenced, use this guide: Audit Rules Set Up Guide
Do a keyword search for: Using Report Start Date and Report End Date Fields.
Thank you,
Kevin Dorsey
SAP Concur Community Manager
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