Mistake in GSTR 3B

I made some mistake while filing GSTR 3B for July. I made couple of sales in 2 different states of Rs 179 and 169 at 18% GST. While in the return i input the tax amount correctly, unfortunately I made mistake of inputing sales amount as 199 each.

I realized this mistake only now while filing GSTR 1 quarterly. What should i do now? If I entered the wrong amount of Rs 199, GSTR 1 will calculate wrong GST.