@sam_s0ni Apache NiFi never intended with the context of the NiFi framework to allow parameters to be dynamically accessed within NiFi Expression Language (NEL). The EvaluateElString() exposed a bug in which this was possible while never intended. That bug was addressed in apache NiFi 1.19 thus resulting in what you are seeing. As an alternative, you could store your schemas in an external database and pull those schemas back dynamically based on a FlowFile attribute instead of using Parameter contexts to store those schemas. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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