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If you have a more specific context or details about "SSIS-109," I'd be happy to help create a more targeted write-up.
In older versions (SSIS 2005/2008), variable updates were often handled via the (requiring C# or VB.NET code) or by setting expressions directly on the variable itself. The Expression Task provides a "low-code" alternative that is easier for new developers to track within the package. SSIS-109