Problem deleting a map

[hvillega@bancolombia.com.co]

Hello :   AIX  V 4.3.3  -  Netview  5.1.3 .    I normally use two maps :
The default and an operator map.   Today appeared a map  with the
Permissions  " Unknown "  and in Comments appear "  Non-local map " .
Does anybody know how  can I delete this map ?

Thanks