It seems that only custom fields for Ideas can be flagged as Required Fields. I would like to be able to specify custom fields for features and requirements to also be required. For example, I integrate requirements with TFS as backlog items. (Features go as Features). I want each requirement to include Type as Bug or Product Backlog Item because these are the two types of backlog items I have define in TFS. I don't have many bugs start in Aha! but it happens and I want to push them into TFS as a bug work item. If left blank, the TFS item will be a PBI.
An alternative approach is to set a default value on a custom field. That way, it at least defaults to something and is less likely to be left blanks.
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