Itc claimed in wrong column, but right head (IGST) in gstr 3b 2017-18

Hello,

In one month in 2017-18, I claimed ITC (IGST) under "Inward supplies liable to reverse charge" Table 4(A)(3) in GSTR 3B , instead of under "Import of Services" Table 4(A)(2). 

How to correct this now? And how to show in GSTR 9?

Thank you!