Allied Telesis SwitchBladex8112 Installation Manual page 314

Chapter 16: Building a Stack
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the first chassis. If the two chassis have the same licenses and
enabled features, you may go to "Setting the ID Number" on
page 315. If they are different, do not continue. The two chassis
cannot form a stack if they do not have identical features. Before
continuing with this procedure, add or delete features or licenses
from one or both chassis so that they have the same feature set.
Note
Two switches that have different OEM territories probably have
different feature sets. The two switches will form a stack but only if
they have the same features. This may require the installation or
deletion of features or licenses from one or both units.
Section III: Building a Stack with VCStack Plus