You can add validation logic to enforce a rule, in this case the rule that an order's ship date must occur after the date the order was placed. You will create your validation rule using ADF BC's declarative validation capabilities, and define the logic using the Groovy scripting language.
To begin adding a validation rule, you will click
Add next to
Validation Rules on the overview editor, General page:
Validation rules can be added in the Add Validation Rule dialog: