Intimation under sec 143 (1)(a)

Head of Income/Schedule under which reported in the returN 

WHAT is it means.. its not mentioned in your article also..

plz confirm

https://help.cleartax.in/hc/en-us/articles/115010792968-Communication-of-proposed-adjustment-u-s-143-1-a-How-to-resolve-

this may help you

People have confirmed from the IT Dept,that intimation u/s 143(1)(a) is not to be replied immediately and we should wait until further communication from the Dept.

It has been 1 week since I received my intimation u/s 143(1)(a),and I have not received any further communication.Has anyone received any communication after  intimations u/s 143(1)(a)?