SAP SCMTMSTOR311 - Forwarding order & freht unit &2 is

tor311FlyGTA Airs international flht TOR311 connects Canada and Bahamas, flying Toronto (YYZ) to Nassau (NAS). This flht takes off from Toronto, Pearson at 10:00 on May 1,What is the cause and solution for SAP error message SCMTMSTOR311 - Forwarding order &1; freht unit &2 is not ready for planning ?