If you specify the outside boundary condition as
"zone", you will get what you want.
A6, \field Outside Boundary Condition Object
\type object-list
\object-list OutFaceEnvNames
\note Non-blank only if the field
Outside Boundary Condition is Surface, Zone, OtherSideCoefficients,
\note or
OtherSideConditionsModel
\note If Surface, specify name of
corresponding surface in adjacent zone or
\note specify current surface name
for internal partition separating like zones
\note If Zone, specify the name of
the corresponding zone and
\note the program will generate the
corresponding interzone surface
\note If OtherSideCoefficients,
specify name of SurfaceProperty:OtherSideCoefficients
\note If OtherSideConditionsModel,
specify name of SurfaceProperty:OtherSideConditionsModel