Bug: Custom Date Fields can no longer be used for scheduling when you change your filter data.
When you create a filter to use in your Advanced Roadmaps and you change the filter data, any supported custom date picker fields use in the scheduling configuration will disappear.
When you try to schedule your plan by those custom fields in your scheduling configurations, the only options in the drop down menu that appear are: target start/end and due date. The only way to fix it is to create an entirely new plan.