Hi Ravi,
One possibility is to Delink Inbound from EWM. i.e. Update the Flag - VLSTK from B [Distributed] to [Blank] for the Inbound delivery.This will allow you to Edit Inbound delivery in R/3 [Update necessary fields and complete GR in R/3 Only]
Updation of the VLSTK feild [table - LIKP] would require Debug Edit acess.
Thanks,
Sharad