CA Tech Tip from Umberto Comotti, Principal Support Engineer, for October 22, 2015.
COVERED_ADD command can be issued to "cover" an area without recycling the MUF region. Once executed, the command is accepted in MUF but it takes effect only when an area goes from a closed status to an opening status.
Being so, if an area is already open when the command is issued, it must be closed and then reopened.