Return to Vendor using 161 in EWM

Hi

I have a business requirement to create Vendor Return from SAP EWM, my business is expecting to create return delivery (161) in EWM so that vendor return PO will get created in ECC and business will deliver material back to vendor.

Can anyone please suggest me a best possible way to do it.

Secondly, i was trying to do return to vendor from inbound delivery then i was getting a error message :

Unknown error has occurred in target system (DEVCLNT400)

Message No. /SCWM/DELIVERY_UI056

Please suggest me

Thanks & Regards

SAP Pandit