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"Error: Original Source:Unknown service class" is displayed while creating a NAT policy.
03/26/2020 
11 
12197
DESCRIPTION:
This KB article explains the reason of the error "Original Source:Unknown service class"displayed when creating a NAT policy.
CAUSE:
Technically it is not possible to translate single port into multiple port numbers, so when a NAT policy is created to translate single port number to multiple port numbers it will throw an error message "Error: Original Source:Unknown service class".
RESOLUTION:
When creating a NAT policy, make sure that service translation is configured correctly, single port number can be translated only to one port number.
NOTE: Vice versa is possible, multiple ports can be translated into single port.
