In case there are certain fields required for specific issue types and this requirement condition is modelled with a workflow validator, Advanced Roadmaps won't bring up the Create issue dialog when trying to commit an issue of this type to JIRA and hence the issue creation will fail.
Steps to Reproduce
Navigate to the workflow configuration page and select one to edit.
View the workflow digram and select the Create Issue transition.
Select the validators link and add a Field Required Validator
**Publish the changes to the workflow
Returning to the plan, create an issue applicable to this workflow
Click on Review Changes, and then Save Selected Changes
The workflow validation will be applied and the "Changes cannot be saved" notification is displayed to the user.
On the new improved interface:
The workaround doesn't apply to system fields that are locked by default (ie. Parent Link, Team)
We are working on better supporting required fields via workflows.