Hi Raja,
The current standard CSV data source is intended for demo and prototyping purposes only. There is no automatic update mechanism. Ideally you should make sure you have all the data you need from the beginning and then don't edit the file after that as it may become inconsistent with the metadata, which is probably what you are experiencing.
The CSV file is normally generated by exporting a live data source from the Initial View editor. Instead of manually editing your CSV file to update it, you could simply export a new CSV file each time you need a data update and then completely replace the old file with the new one.
Regards,
Mustafa.
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