Hello @Madhanlal Vannu ,
Thanks for posting the question and welcome to Microsoft Q & A .
I think I was able to repro the issue but that only happens for me when the worksheet name is not selected .
Please find the details in the image , hope this helps .
In case if you are still facing the can you please, please help us with more info .
1.Are you reading a single worksheet ? If yes how many records does that have .
2.Can it be possible to share some dummy data , so we can investigate this further . Please send an email to email to AzCommunity@microsoft.com with the below details. We will respond to the thread with our findings.
Thread URL :https://learn.microsoft.com/en-us/answers/questions/71311/mapping-data-flow-0-total-columns-source-excel.html
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Subject:Attention : Himanshu
Thanks Himanshu
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