Workflow:
Complete Parked Invoice for Posting 
Use
As of Release 4.6C, you can control the document parking process in Logistics Invoice Verifcation via workflow. You implement this workflow if one group of employees parks invoice documents and another group completes the parked invoice documents for posting.
Effects on Customizing
To implement the workflow, maintain the
activity 
Activate Workflow Template for Document Completion in the
Implementation Guide (IMG) for Logistics Invoice Verification.
See also
For more information, see the SAP Library at MM - Materials Management: Workflow Scenarios -> Document Parking: Complete Invoice for Posting (MM-IV-LIV).