Test Case 2

Instruction to reproduce the issue:

• Click 'Copy source list data to destination list' button and an error occurs: 'An item with the same key has already been added. Key'."
• Go to this test case's flowchart(2031562) and navigate to the Copy data Node (20194128). Check the Copy data Node data sources and update one of the field names (e.g., update the 'Name' field under the 'Personal Info' folder in the Source list) and publish the project.
• Click 'Copy source list data to destination list' button again. You will notice that the error no longer occurs."

Explanation: From what’s happening, I can say that the error occurs because the source list had duplicate field names in different folders. Updating a field name resolves the conflict.