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Dynamic meta injection - How to create?

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Hello,

I created a simple transformation (Read-XLSX-template.ktr) that reads XLSX file template (number of columns, its names and order) and pass it through to another transformation using metadata injection step.
Now I would like to reuse this (Read-XLSX-template.ktr) transformation and make it dynamic.
Everything works like a charm as long as transformation in ETL Metadata Injection step is manually set. When I replace it with variable everything crashes.

Is there any way to make ETL Metadata Injection step dynamic ?

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