We are OnDemand client. We want to limit the selection for FixVersion field to one option only, however, we didnt found an option for this. We decided to hide the FixVersion field and to create a custom field called Fixed Version, which is using the versions entries, but allows a single selection.
Once we did this - our BurnDown charts stopped working and based on the information i have found, they incrementally rely on this FixVersion field.
How can we fix this situation?