Income tax notice issue

Hi,

For the AY 2020-21, for my client who has Income from Astrology profession, I have filed under "Non specified profession - without books of accounts" (obviously without balance sheet and p&l)
Recently he received a defective notice, asking to submit a balance sheet and P&L.
This is how I have been filing for him for the past 4 years and we have never had this issue before. My client's income is less than 10 lakhs.  
Wondering how and why this popped up.  
Can anyone suggest a probable reason?
Thanks in advance!