Recently a officer call goes to my client and he said that there is a difference between GST R 1 and 3B of 68000/- in year 2020-21, When i reconcile this matter I noticed that there is a mistake in 2019-20, 4 Quatar Gst R 1 Filled nill by mistake but GST r 3b Filled As it is. and i upload these bills of 2019-20 of quator 4 in 2020-21 in month of June -2020.
my query is in this matter is my client liable of any penalty or interest? and why