Does Merge work different within a created Function?

Just to be sure as your example is not a reprex (if you could make one it would be awesome): how many columns are there in frpm ? You are renaming all to "CDS_CODE" here I think.
In your previous code you rename just one column

Is there something off here or do I misunderstood?

Please a reprex is needed here. It will help us help you and I think it will help you while trying to build the reprex. Thanks.

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