Stock In transit to be cancelled

Hi,

I have a business requirement to cancel the open outbound delivery ie 641 & 643 Document whose PGI & subsequent MIGO has already been done against out bound delivery & client need to cancel all these to match the actual delivered quantity with the received quantity at the receiving plant

please advise me how to do this & What would be accounting effect for the same

refer the screen attached screen for the inta company,

Outbound is for 34 RMT, & GR Prepared only for 3.30 RMT, Balance quantity not dispatched from the delivering plant hence not received at the receiving plant, there were number of deliveries open like this,

Thanks,

K J