Cannot create issues when required fields are configured in workflow rather than field configuration

Summary

In case there are certain fields required for specific issue types and this requirement condition is modelled with a workflow validator, Portfolio won't bring up the Create issue dialog when trying to commit an issue of this type to JIRA - or will not show that field in the screen - and hence the issue creation will fail.

Expected Behavior

Follow the configuration from JIRA's "Create Issue" screen, showing all of the fields that have been configured there also in the screen brought up by Portfolio.

Actual Behavior

If there are required fields setup through the workflow, or if a workflow function require any fields that are not marked as "Required" in JIRA's field configuration, the issue creation through JPO will fail.

Workaround

Set the field as "Required" via field configurations and screens and specify the field behaviour this way.