These invoices are essentially in a draft status. This is the last point where the creator can make changes.
Waiting for Approval
These are submitted invoices that require one or more additional layers of approval.
Batch
These are approved invoices or invoices created by Accounts Payable that do not require approval. This is the last point where Accounts Payable can make changes.
Open
These are ready for check printing. (The Batch Update process moves invoices from Batch to Open.)