11.9.2. Service Information 
- Prior to deletion of the port, the night option belonging to it must be deleted (interrogation and deletion of the appropriate night option with the NAVAR AMO). Before this, however, the night option must be released from the allocation to the ATND group (VFGR AMO).
- If this night variant was the only one, or was provided for automatic night service (AUTNS), this must be replaced by a substitute variant by means of CHANGE-VFGR.Service Information