The following is a list of standard Approval objects:
DEAL
DEAL LINE ITEM
DEAL TERM
OPPORTUNITY
OPPORTUNITY LINE ITEM
AGREEMENT
AGREEMENT LINE ITEM
AGREEMENT TERM EXCEPTION
QUOTE
PRODUCT CONFIGURATION
LINE ITEM
PROPOSAL LINE ITEM
For standard objects, Approval administrators do not need to configure the Approval Status field. To enable Approval workflow on objects apart from the above-mentioned standard objects, administrators need to configure the Approval Status field. For information on creating Status Fields, refer to Adding Approval Status to Objects.