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How to make Metadata structure stream work dynamically?

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Hi,

I am having Excel input step --> Metadata Stream --> Text file output. How to make it work when the Excel file changes from file 1 to file2(dynamic variable) and the respective colum values changed ? say file 1 has 4 columns and file 2 has 6 columns . when I run the ktr without clicking get fields in Excel Input step , it fails :( . any suggestions ??

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