Which measures are you attempting to add up? VDNs and Skills are not apples and apples. Your VDN can queue to multiple skills and the skill can be called directly or via multiple VDNs.
A copy of both reports would be helpful but this assumes you are 100% sure that the VDN always queues to the skill (what happens Out of hours, holidays, emergencies) and that the skill is never called directly or via another VDN.
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