Dynamic Header Values in Flat File Destination

Hi,
I have to put 'T' or 'P' as part of a header in a flat file destination. The header is sourced via a work table which defines what the header looks like. One of the columns should contain 'T' for test or 'P' for production. When the package is executed in
the test environment, 'T' should appear as part of the header. When the package is executed in the production environment, 'P' should appear as part of the header.
Any ideas on how to achieve this is very much welcome.
Thanks,
AJ

Package parameter indicating the environment and a DerivedColumn transform that generates a column with T or P depending on the parameter value.

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