GreenHopper does not yet support a custom field coming from a third party plugin. The GreenHopper mechanism for fields is based on the JIRA field type, classes like TextCTF. We will need to create a GreenHopper template for each type.
We would like to make the BillingKey field from the Tempo Plugin mandatory to prevent broken work log entries. However when trying to create an issue using the Card view in GreenHopper the drop down for BillingKey does not appear, just its label with an asterisk marking it as mandatory.
Not being able to create issues in CardView takes a lot of the streamlining away that GreenHopper gives us.