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Question:
What is the difference between the option "Prefill table with data from another table" from the Task configuration and "Table - All columns" from an Assign Data step? 

Answer: 
If we select the "Prefill table with data from another table" option in the task configuration, the data will only move to the index field and the database after the user confirms the task. However, if we use "Table - All columns" while in an Assign Data step, it will insert the data into both the index field and the database without any user confirmation. It is important to note that the data will not appear immediately in the table field if we prefill a table with data from another table.

KBA is applicable for both Cloud and On-premise Organizations.