The match simulation operations will not take into account the built-in blocking key - 6.3

Talend MDM Platform Release Notes
EnrichVersion
6.3
EnrichProdName
Talend MDM Platform
task
Installation and Upgrade
EnrichPlatform
Talend Activity Monitoring Console
Talend Administration Center
Talend Artifact Repository
Talend CommandLine
Talend Data Preparation
Talend Data Stewardship
Talend DQ Portal
Talend ESB
Talend Identity Management
Talend Installer
Talend JobServer
Talend Log Server
Talend MDM Server
Talend MDM Web UI
Talend Project Audit
Talend Repository Manager
Talend Runtime
Talend SAP RFC Server
Talend Studio

You may use the built-in blocking key when defining a match rule. However, the match simulation operations will not take into account the built-in blocking key.