There 2 return scenario's and they are:
Scenario 1 - Perform stock return when vendor delivery is accepted in EWM and returning a portion or all of the delivery to vendor.
Scenario 2 - Perform stock return when a PO is placed and entire delivery is refused.
Scenario 1
Create inbound delivery in ECC and distributed to EWM.
Create inbound delivery with reference to inbound notification from ECC to EWM.
Create warehouse task.
system print pick will be created automatically.
perform the physical picking.
verify the pick quantity.
Confirm the task.
verify the GR.
create return delivery.
Display the bin stock in EWM
verify the returns in ECC
Scenario 2
create the inbound delivery in ECC that is distributed as inbound notification in EWM delivery.
create inbound delivery with reference to inbound notification from ECC to EWM.
Reject the delivery.
Display the bin stock in EWM.
I hope it will help you to resolve your issue.
Regards
Irfan A B