FreezerPro does not indicate if a vial resides in a picklist or not, and, what is more, it can be added to multiple pick lists without any objection from the system. This can, for example, result in multiple shipments working with the same vials and subsequent situations where samples intended for a shipment end up already shipped in another shipment.
It would be useful to have a Sample Availability field, where we could label samples as Available or Reserved