UnscheduledReason

"""
Why work remains unscheduled; capacity reasons describe the selected plan, not a proof of impossibility
"""
enum UnscheduledReason {
  """No eligible work centre supplies the required capability"""
  NO_COMPATIBLE_RESOURCE
  """Compatible work centres have no available shift in the window"""
  NO_AVAILABLE_SHIFT
  """Work cannot be released before the planning window ends"""
  RELEASE_OUTSIDE_HORIZON
  """A prerequisite has not been allocated in this plan"""
  PREDECESSOR_UNSCHEDULED
  """No suitable slot was found in this candidate plan"""
  NO_FITTING_SLOT
  """
  An unfinished operation has a pin ending before this window; update or unpin it, since completion cannot be assumed
  """
  EXPIRED_PIN
  """An existing pin places completion outside this planning window"""
  PINNED_OUTSIDE_HORIZON
  """A dependency cycle prevents ordering this work"""
  CYCLIC_DEPENDENCY
}