When an particular pick completed order is being cancelled either automatically sync from sales channel (Marketplace & Webstores) or manually cancelled by user in WMS Ui, user are required to perform put-away.
Step-1 & 2 : Go-To "Put-Away" from primary panel, select "Cancelled".
Step-3 & 4 : Assign the cancelled order to an operation user
Step-5 : Qc the product, and put-away to complete. 
Anchanto Support