Thankyou for using Microsoft Q&A platform and posting your question .
As I understand your issue, you are trying to make use of dataflow parameter in mapping dataflow .
However, it's throwing error when you are using the same parameter in expression building. Please let me know if that's not the case.
I tried to reproduce your scenario and it works well for me without any issue.
Kindly make sure the expression checkbox is unchecked in the parameter tab of Dataflow activity.
Please let us know if it resolves your issue.
Hope this will help. Please let us know if any further queries.
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