How can i make a field mandatory on a transition screen for one group only?

Hi there,

we have this use case: A customer is not able to see the time tracking field. However, we have some workflow transitions that require mandatory input from the status Open -> In Progress for the Time Tracking fields.

Since this field is not visible for the customer, only internal guys can see and fill this field. We use the JSF plugin to hide the time tracking fields from customers. However, I also don't want for the customer to fill a time tracking field.

Now... Is there any way that I can make the Time Tracking field mandatory for all internal guys, but not for customers on the same screen? Or can I assign different screens in the same project on the same transition for different groups?

Thanks