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You have created a custom error message for your validation rule; the {0} and {1} are placeholders for parameters that you will define as the labels of the OrderShippedDate and OrderDate attributes. ADF Business Components allow you to create custom labels for each attribute; these labels are stored in message bundles that can be translated for different locales, and they are automatically displayed as the attribute's label on client pages. In this example you have not defined custom labels, so the labels default to the names of the attributes.

The validation rule you created should look like this on the Business Rules page of the overview editor for entity objects:

Overview editor, Business Rules

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