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OpenVPMS understates active clients by 10%. This gas has been manually verified. The logic for active client numbers in OpenVPMS has not been investigated. SmartVetApp counts all clients that have paid a positive value invoice in the last 365 days. Manual verification of the same criteria in OpenVPMS using invoice based reports gave less than a 1% deviation vs the Active client report in OpenVPMSSmartVetApp.