From Sales Order Maintenance (OE):

Enter the Sales Order Header	Place On Hold
Enter a Sales Order Line	Release From Hold
Enter a Sales Order Line Using Qic-Entry	Apply a Customer Deposit
	Create a Blanket Order
	Replace a Component Under Warranty

See Background and Road Map for more information.

From One-Step Invoice Entry (RE):

Enter a One-Step Order	Create a Credit Memo for Returned Items
Adjust the Amount the Customer Owes	Create a Credit Memo to Change the Price
Reverse an Existing Invoice	Create a Credit Memo to Correct Shipping Charges
Create a Debit Memo	Create a Credit that Does Not Affect Inventory
Create a Debit Memo to Correct a Credit Memo

See Background and Road Map for more information.