Gst itc but input not received

Aman Kumar (Accounts Executive) (744 Points)

16 April 2019  
My company generated sale invoice in fy 2017-18.but without client GST no.then we filled GSTR-1 as per B2C.but my client take ITC.

but my company filling gst return without my client GST no.Filled B2C.now my client said we can take itc.

what is solution for ITC?