Watchguard Firebox X1000 User Manual page 153

Service Precedence
group always have higher precedence than the services of
a lower precedence group, regardless of their individual
settings. For example, because the "Any" service is in the
highest precedence group, all incidences of the "Any" ser-
vice will take precedence over the highest precedence Tel-
net service.
The precedences of services that are in the same prece-
dence group are ordered from the most specific services
(based on source and destination targets) to the least spe-
cific service. The method used to sort services is based on
the specificity of targets, from most specific to least spe-
cific.
User Guide 131