WESM zl Management and Configuration Guide WT.01.03 and greater

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Introduction
ProCurve Wireless Edge Services zl Module
For example, suppose you install an additive 48 RP License on a Wireless Edge
Services zl Module so that it can adopt 60 RPs. Later, you decide that a different
module should support additional RPs. You uninstall the additive license from
the first module and install it on the second. In other words, if you need to
move RPs within your network, you can move RP licenses instead of moving
an entire module.
Note You can move only additive licenses. You can never remove a module’s
original license for 12 RPs and install it on another module.