Metadata on data flow path not updating

I have a data flow task with a single source and destination task. I'm having the source task creating a table from a variable expression and the destination table also created from a variable expression. I'm running this under 3 scenarios in which each scenario has a different source and destination table. They are different in name but close in table structure with the exception of one column being different. The Metadata for the source flow path seems to be "sticky" in that it is not modifying the source table structure in the flow to account for this different column. I'm not sure how to adjust this. Any ideas? I've modified several properties in the task and data flow but nothing seems to make this adjustment in run-time.Metadata cannot and does not change dynamically nor at runtime.

This is by design and there's very little you can do to get around that, short of coding your own application using the SSIS API.