The documentation does not explicitly state the fact that only those variables are visible in the Expression Builder that are in the current scope. For example, if you have an Execute SQL Task in the Control Flow tab and another Execute SQL Task in the Events Handlers tab, certain variables like -@[System::ErrorCode], @[System::ErrorDescription], @[System::SourceName], @[System::SourceDescription] etc. are visible just in the Property Expression Builder of the latter.
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